CodexGameDev/research/agent_handoff.md

Agent Handoff — Private Research Notes

Last updated: 2026-08-18, after the completed Experiment 008 interpretation and validated Experiment 009 implementation.

This file is written so another agent can continue the research program without reconstructing the reasoning. The player intends not to read it before playtesting, to avoid expectation effects. It contains design hypotheses, likely failure interpretations, and things to watch for.

Current Handoff Snapshot — Read This First

Date: 2026-08-18.

The current playable is Experiment 009 — Catalyst Ascent revision 1 in experiments/009_catalyst_ascent/. Experiment 008 is closed: the player enjoyed building but found it meaningless because nearly any build or baseline fire seemed viable. Experiment 009 tests the designer interpretation that construction needs capability-sensitive consequence; it does not assume that more difficulty is the solution.

Run it with:

./experiments/009_catalyst_ascent/run.sh

Then open http://127.0.0.1:8000/experiments/009_catalyst_ascent/prototype/. The custom local server writes validated logs directly to repository JSONL/ when the player presses Save JSONL. Validation artifacts were moved out of JSONL/; only player logs should remain there. The validation server and Chromium process were stopped at handoff.

The actual research objective

Do not optimize a known game concept or assume the original “magic engineering” aspiration is already correct. The task is to discover what this particular player finds fun through small playable experiments. Behavioral persistence, objective completion, experimentation, difficulty, and high input counts are not fun scores.

The player's explicit epistemic warning is central: they are an imperfect playtester. Preserve four separate layers:

1. observed behavior;
2. reported felt experience;
3. the player's causal explanation;
4. the designer's competing interpretations.

Their reports of boredom, frustration, interest, and desire to stop are high-value evidence. Their explanations and predictions about unbuilt variants are hypotheses, not ground truth. Likewise, do not override their experience merely because telemetry shows active or sophisticated play.

Current working model

The strongest current inference is not “the player dislikes systems,” automation, puzzles, pressure, construction, or chaos in general. Every tested prototype has failed in a more specific way:

• system distinctions did not affect an adequate answer;
• technical manipulation had no valued downstream consequence;
• one tactic became universal;
• physical layout was cosmetic and parts were counters;
• a visible model was not strategically legible;
• a genuine self-directed question produced no satisfying consequence;
• readable chaos accumulated until interventions became unavoidable self-sabotage.

The current compact theory is:

Fun can arise from building a causal capability, discovering how components amplify one another, and expressing that understanding as visible power. For the activity to remain meaningful, problems must distinguish capabilities through consequences while still admitting multiple causal routes.

This remains a hypothesis. Experiment 007 supplied the first successful curiosity chain and Experiment 008 isolated enjoyable building from meaningful consequence. Experiment 009 now tests whether capability-sensitive problems join those two qualities, while guarding against the alternate explanation that added resistance merely makes a serviceable shooter compulsory.

Experiment history in one page

000 — Resonance Bench

Abstract node-and-signal construction. The player solved all observations in roughly three minutes, did not notice cycles or defined vector direction, and had no desire to continue. Permissive predicates meant the intended laws never entered the strategy. This is not clean evidence against technical systems generally.

001 — Flux Familiar

The signal network controlled a body in a spatial arena. The player wanted to stop almost immediately. It felt like brute-force steering through an indirect interface; imagining sensors/AI sounded tedious. Treat that imagined variant as a prediction, not a tested result.

002 — Conversion Breach

Direct heat extraction/injection and heat-to-momentum combat. This produced the longest play and the first contextual tactical revision: extracting heat simultaneously created ammunition, slowed enemies, prepared brittle collision damage, and depleted future fuel. The player learned not to maximize extraction blindly.

However, wall impacts became the universal answer. Revision 2 matched Calm and Breach, fixed input/layout/wall issues, and reached Breach wave 29, but extreme multiplicative conversion made starting heat erase later waves. Pressure and rapid power sustained activity; they did not sustain new reasoning or reported interest. Do not use run length as proof of fun.

003 — Rig Trials

A directly piloted modular rig faced Haul, Furnace, and Gale. The player called it boring despite completing everything. Controls were fine. Furnace meant “replace almost everything with Sinks,” Gale meant “restore default,” and lattice placement barely mattered. Requirements caused obvious counter-loadouts, not meaningful recomposition.

The player independently invented a two-tractor cargo-juggling workaround after overlooking Sinks. It was still boring. This corrected an important methodological mistake: voluntary experimentation/problem solving is not sufficient evidence of fun.

004 — Invariant Rooms / player title Paired Rooms

Two bodies moved oppositely; walls blocked them independently, allowing midpoint ratcheting. Rooms 1 and 2 were obvious without requiring a model. Room 3 jumped abruptly to latent-state planning and was brute-forced in 94 commands. The visible yellow midpoint cross was not noticed as a planning tool during the required sequence.

In the open chamber, the player performed a genuine unrequired experiment: they tried to move the yellow cross against a wall. That question was not satisfying to answer. This is the cleanest evidence so far that self-generated curiosity-like behavior alone is not enough. Better scaffolding could repair the transfer test, but would not give the abstract answer value.

005 — Sanctuary Wake

A direct keeper used indiscriminate pull/push on pods, raiders, and wreckage during a three-minute rescue shift. The player wanted to stop almost immediately but actively completed the exact timer: 6 rescued, 18 lost, 17 raiders broken, 89 field sessions, and no overtime. Controls were fine and the chaos was readable.

The player did not care about the outcome. As wreckage accumulated, nearly every intervention risked pushing pods into raiders or wreckage into the sanctuary. The state was unmanageable, not incomprehensible. Charge depletion was merely annoying. This was accumulating contamination, not recoverable chaos: mistakes shrank the future action space.

Why Experiment 006 exists

Breakline is a controlled contrast to 005 and tests H20: assertive, selective agency may be more intrinsically valuable than custodial control.

It has:

• direct WASD movement;
• an aimed short strike that damages, knocks, and reflects hostile projectiles;
• a targeted tether that pulls wisps/gunners toward the player but pulls the player toward heavy anchors;
• an invulnerable offensive dash that damages enemies crossed;
• damaging fast enemy-on-enemy collisions;
• health regeneration after a safe interval;
• automatic local restoration after defeat;
• Drift, Crossfire, Weight, and seeded Remix available immediately.

It intentionally has no timer, field resource meter, upgrades, unlocks, persistent damage, construction, rescue objective, or hidden law. Clearing grants no power. The player can switch, replay, remix, or stop at any time.

The key question is not whether they clear all arrangements. It is whether any verb or interaction is enjoyable enough to repeat, refine, or combine voluntarily.

Experiment 006 validation state

Files:

• experiments/006_breakline/prototype/index.html
• experiments/006_breakline/prototype/style.css
• experiments/006_breakline/prototype/app.js
• experiments/006_breakline/hypothesis.md
• experiments/006_breakline/README.md
• experiments/006_breakline/run.sh

Validation completed:

• JavaScript and shell syntax pass.
• The complete layout was visually inspected at the player's 1672×976 viewport.
• Browser input produced light-enemy tethering and heavy-anchor reverse tethering.
• Strike reflection produced reflected-projectile damage.
• Offensive dash and strike produced damage/kills.
• Player damage, enemy fire/charge telegraphs, arrangement switching, Remix, and direct JSONL saving were exercised.
• A final browser route cleared Drift in 9.97 seconds with six kills, a five-kill chain, four strike hits, two dash hits, and no defeat.
• The validation JSONL was deleted; only player logs remain under JSONL/.
• The validation server and Chromium were stopped. Port 8000 was free.

Known validation limitation: the damaging enemy-on-enemy collision branch was code-reviewed but not deliberately triggered during the final clear route. Do not claim otherwise. The mechanism may still prove too difficult to use intentionally.

Experiment 006 telemetry summary

The player saved JSONL/breakline-360f3f3f-1e5c-442d-8fdd-7f4976b17b29.jsonl. Preliminary analysis is in experiments/006_breakline/results/360f3f3f-preliminary-analysis.md.

They cleared all four arrangements without defeat, saved, then voluntarily replayed and cleared Drift and Crossfire before saving again. The replay patterns are unusually specific: Drift replay used one strike to hit and kill all six wisps simultaneously, while Crossfire replay used 14 reflections and only two direct strike hits. Across the session there were 42 kills: 22 strike, 12 reflected projectile, and 8 body collision.

This initially looked like the strongest voluntary replay signal yet, but the completed report below establishes why replay must not be labeled fun from behavior alone. Strike/reflection dominated (56 strikes, 34 reflections); tether was used only five times and dash once with no hit.

Experiment 006 complete player report

The Drift replay was another overlap experiment, not an intentional one-strike clear. The player had missed enemy-enemy collision, saw the cluster would not compress further, and happened to kill all six with the next swing.

The Crossfire replay was intentional: the player noticed reflection late and returned because it seemed interesting, comparing it to reflecting a Minecraft ghast fireball back at itself. The final follow-up established that this was mechanic recognition, not enjoyment. The player was ready to stop after the replay. In use, reflection required aiming at a moving enemy while timing a nearby projectile, which pulled attention away from other incoming projectiles.

Body-collision kills were incidental and not understood. Tether was abandoned because pulling enemies closer worsened position with little payoff. Dash was unnecessary and cognitively easy to forget; the player says reactive dodge mechanics generally require preplanning for them to remember, though they do not claim dodging cannot be fun.

The final result is that 006 found no intrinsically enjoyable base verb. Strike was adequate, tether was actively disadvantageous, dash stayed outside attention, and reflection was conceptually appealing but operationally attention-splitting. Do not interpret optional replay as fun. Also do not generalize this into “all counters are bad”; target aiming, projectile timing, and peripheral defense were bundled together.

The next high-information hypothesis is authored capability trajectory. Experiment 002 suggests rapid chosen growth can sustain play, but its numerical upgrades converged on one universal answer. A controlled 007 should put two short runs on the same low-demand combat substrate: one with straightforward numerical amplification and one with exact, qualitative effects that visibly combine. Measure anticipation, choice deliberation, voluntary continuation/replay, and whether the player wants to see another interaction. Do not use kill counts or run completion as a fun score.

Experiment 007 implementation and validation

Experiment 007 is implemented as Catalyst Trials. It uses a square top-down field with only WASD/arrow movement, cursor aim, and hold-left firing. There are no secondary verbs, enemy projectiles, dodge buttons, random drops, unlocks, or upgrade scarcity. Contact threats are intentionally simple so 006's multi-target reflection burden is not reproduced.

Each session randomly maps mutation and amplification to neutral Trial I and Trial II slots. Both trials are immediately selectable and share the exact same five deterministic enemy layouts, baseline weapon, enemy health/speed, player health rules, and four inter-field choices. The order is stored in every JSONL event as condition and initially as condition_order.

The amplification condition always offers:

• Power Core: ×1.7 direct damage per level;
• Cadence Drive: firing interval ×0.65 per level;
• Wide Aperture: projectile radius ×1.55 per level.

The mutation condition always offers:

• Fork: a primary hit emits two additional fragments per level;
• Bloom: a kill emits 1 + 2 × level seeking sparks;
• Arc: every max(2, 6 - level) projectile hits damages up to 1 + level nearby enemies.

Fork fragments can kill and trigger Bloom. Bloom sparks count as projectile hits and can trigger Arc. Arc kills can trigger Bloom. Recursion is bounded: fragments cannot fork again and arc damage does not increment the arc counter.

The full-screen layout was visually inspected at 1672×976. JavaScript and shell syntax pass. A headless play pass cleared all five amplification fields with the planned build power 2 / rate 1 / width 1; this was reachability validation, not balance or enjoyment evidence. A deterministic browser pass then completed all five mutation fields with fork 1 / bloom 2 / arc 1, recorded Fork, Bloom, and Arc triggers, and successfully uploaded 282 valid events through the server. The validation JSONL was moved out of the repository afterward. The mutation debug interface exists only when the page is loaded with ?validation=1.

Expected first-run logs are named JSONL/catalyst-trials-<session>.jsonl.

After the user plays:

1. Find the newest Catalyst Trials JSONL and read condition_order before comparing Trial I/II.
2. Reconstruct trial order, starts/restarts, wave clear times, deaths, choice order, deliberation time from choices_shown to upgrade_chosen, mutation trigger chains, saves, and any replay/switch.
3. Write a preliminary result under experiments/007_catalyst_trials/results/ before asking follow-ups.
4. Ask about intention and experience, not whether qualitative upgrades were “better.” Useful neutral distinctions: whether any choice pursued a planned interaction or just apparent strength; whether its realized result was satisfying versus merely legible/interesting; when stop desire began in each trial; whether a later choice reversed it; whether they wanted a different build afterward.
5. Treat completing both trials as likely compliance with the comparison. Do not interpret more triggers, faster clears, deaths, longer duration, or a repeated choice as fun without report/behavioral support.

Important confounds:

• Trial order is randomized but this is still one player/session; familiarity and fatigue remain.
• Mutation is more audiovisual and may be stronger despite approximate pacing control.
• Upgrade descriptions expose their behavior, so this tests composition/authorship more than hidden discovery.
• Four decisions may be too few for a build identity, but adding a long run before the core earns it would repeat prior mistakes.
• The action substrate is intentionally merely serviceable. A null result could mean progression cannot rescue an unwanted activity, not that all buildcraft is unfun.

Experiment 007 complete report

The player saved JSONL/catalyst-trials-56ccf2a6-9613-4da1-86aa-3c5d61797784.jsonl. Preliminary analysis is in experiments/007_catalyst_trials/results/56ccf2a6-preliminary-analysis.md.

The randomized mapping was Trial I = mutation and Trial II = amplification. The player cleared Trial I with Fork 1 / Arc 3, saved, cleared Trial II with Rate 2 / Width 1 / Power 1, saved, then voluntarily replayed Trial I with Arc 4 and saved again. All 15 fields cleared first attempt; there were only two damage events and no defeats.

The Arc-only replay began after both trials were already complete and saved. Its four choices took approximately 1.0, 0.9, 0.6, and 0.6 seconds. The player confirms it was a deliberate test of Arc's isolated strength; Arc alone felt weak.

The player also performed a combined run, tried Bloom, and saw that all three effects played off one another much better than expected. They initially picked Fork and then Arc only because each description sounded interesting, not because they predicted the hit-count interaction. Bloom was skipped because they guessed its value incorrectly; after use, they considered it the best effect and regretted skipping it.

Trial I was interesting enough to replay. Trial II appeared boring as soon as its menu was read. The player saw its numerical upgrades as things that could enhance Trial I's effects, but not as effects that created interesting differences with each other. This is the project's first clear chain of wrong expectation → test → surprising cross-effect result → revised model → additional build test.

The updated save JSONL/catalyst-trials-56ccf2a6-9613-4da1-86aa-3c5d61797784 (1).jsonl supersedes the partial file and contains all five runs: 2,900 events, 25 first-attempt field clears, and no defeats. The later builds were Bloom 2 / Fork 1 / Arc 1 and Bloom 4. Bloom appeared to scale too aggressively, but watching everything disappear after only a few shots was “kind of fun to watch.” The player also spontaneously mapped Bloom to small enemies and Arc to large enemies, identifying conditional target profiles within the very short demo.

This makes 007 the project's first successful probe: inaccurate prediction → chosen test → surprising causal interaction → revised model → several further build questions → conditional knowledge → visible power payoff. Independent numerical upgrades were useful but boring because they did not play off one another.

Do not collapse this into “qualitative upgrades are fun.” Fork/Arc/Bloom share narrow hit/kill interfaces, whereas the amplification options are independent. Bloom also adds homing, and mutation adds spectacle/raw effective power. The next experiment should test whether this causal composition survives a limited module budget and changing enemy ecologies without becoming either a universal full-synergy build or the obvious counter-loadout work that failed in 003.

Experiment 008 implementation and validation

Experiment 008 is implemented as Catalyst Ecology. It preserves 007's WASD/arrow movement, cursor aim, hold-left firing, local wave reset, and exact unrestricted choices. There are no enemy projectiles or secondary combat buttons.

Three expeditions are available immediately:

• Shoal: increasingly dense Mote populations with a few Husks late;
• Bastion: health concentrated in Husks and Titans, with a few Motes late;
• Brood: Brood bodies release a bounded number of Motes into mixed populations.

Corrective revision 2 gives each run eight fields and four inter-field selections after fields one through four. The completed build then persists unchanged through fields five through eight. All six catalysts are offered at each selection, duplicates stack, and there is no unlock order:

• Fork: primary hits emit 2 × level fragments;
• Bloom: kills emit 2 + level seeking sparks;
• Arc: every max(3, 7 - level) projectile hits chain into up to 1 + level nearby bodies;
• Focus: max(2, 6 - level) repeated primary hits on one body produce a rupture for 3 + 2 × level base damage;
• Conduit: every max(3, 9 - 2 × level) secondary hits launches a heavy homing lance at the healthiest body;
• Resonance: multiplies all non-primary damage by 1 + 0.55 × level, but creates no output alone.

Fork/Bloom projectiles feed Arc and Conduit. Arc and Focus impacts feed Conduit. Kills from any source feed Bloom. Conduit lances do not recursively charge Conduit. A per-field budget caps secondary projectile/impact production at 300, preserving large collapses while preventing unbounded Bloom loops.

Validation completed:

• JavaScript, shell, and Python server syntax pass.
• The 1672×976 layout was visually inspected; instructions, population forecast, build, field, and overlays fit without page scrolling.
• Revision 1 deterministic browser flow completed Shoal, Bastion, and Brood with all four choices and all five original fields.
• Brood spawning occurred and remained bounded.
• Focused high-health-target validation triggered Fork 8 times, Focus once, Arc 6 times, and Conduit 3 times; Bloom triggered in the expedition pass. Resonance scaling was active in the focused build.
• Direct upload saved 686 valid JSONL events. The validation file was moved out of JSONL/ afterward.

Expected player logs are JSONL/catalyst-ecology-<session>.jsonl.

After the user plays:

1. Inspect expedition order, completed/abandoned/replayed runs, choice sequences and timing, field population/build combinations, module triggers, kill causes by enemy type, Brood spawns, secondary-budget exhaustion, damage/defeats, and saves.
2. Write a preliminary result in experiments/008_catalyst_ecology/results/ before asking questions.
3. Ask what prediction drove each distinctive build, whether population differences admitted multiple approaches or prescribed counters, which cascades remained understandable, and when stop desire began.
4. Do not infer adaptation merely from different builds. A Shoal/Bloom and Bastion/Focus split may be obvious compliance unless it creates revisions or further questions.
5. Do not infer that a universal build is bad solely because it is powerful. Determine whether it ends reasoning or becomes an expressive baseline with situational variations.

Experiment 008 first-run telemetry and report; corrective revision required

The player saved JSONL/catalyst-ecology-0ac8e60d-a488-4d4d-a4d4-3d220981ef67.jsonl. Preliminary analysis is in experiments/008_catalyst_ecology/results/0ac8e60d-preliminary-analysis.md.

They completed Shoal, Bastion, and Brood once each, in order, with no defeats or restarts and no replay after all three. Builds were:

• Shoal: Bloom → Resonance → Arc → Focus;
• Bastion: Conduit → Bloom → Arc → Fork;
• Brood: Bloom → Focus → Arc → Fork.

Bloom+Arc was universal, while every one of the six modules was sampled somewhere and none was stacked. First-choice deliberation was long (approximately 39, 34, and 26 seconds), while later choices were mostly rapid. Conduit was picked first in Bastion, did nothing alone, then activated after Bloom supplied secondary hits. This could be planned interface composition, experimentation, or misunderstanding.

The player reports that the builds were not meaningfully planned and Conduit-first was a misunderstanding. They believe multiple approaches may exist, but each expedition was too short to formulate which effects played together well. Their repeated experience was starting to see something cool emerge and then having the expedition end before anything really cool happened.

Telemetry confirms the structural cause: the fourth selection was active for only field five—7.1 seconds in Shoal, 19.8 in Bastion, and 22.1 in Brood. Therefore no replay and different build choices cannot be used to infer crystallization, adaptation, or exhaustion.

Correct 008 by retaining the exact four-choice budget and module mechanics while adding multiple post-build fields. Do not add swapping or more slots yet; those would introduce new confounds before mature-build interest is measured.

Corrective revision 2 is implemented. Every expedition now contains eight fields. Choices remain after fields one through four; fields five through eight automatically retain the complete build. Added fields extend each existing ecology with increasing density and mixed durable bodies. JSONL events now use prototype_revision: 2 and log each automatic transition as post_build_field_advanced.

Revision 2 validation completed three full synthetic runs using the first-session builds. Each run recorded exactly eight wave_completed events, four module_chosen events, three post_build_field_advanced events, and one run_completed event. The validation JSONL was moved out of the repository. JavaScript syntax still passes. No module mechanics, choice descriptions, damage values, slot counts, or control rules changed.

After the corrective playtest, compare mature fields five through eight within each expedition. Ask whether interactions became understandable, whether any full build developed or flattened over those fields, whether a specific alternative build arose, and when the extra exposure shifted from useful observation to repetition. Do not compare total duration directly to revision 1 as enjoyment evidence; revision 2 deliberately contains more fields.

Experiment 008 revision 2 complete report

The player saved JSONL/catalyst-ecology-7b7c7a92-42cb-4ab2-8a81-d1316ea972c5.jsonl; analysis is in experiments/008_catalyst_ecology/results/7b7c7a92-revision-2-preliminary-analysis.md.

All three eight-field expeditions completed first attempt without replay. Builds were strongly differentiated:

• Shoal: Bloom → Fork → Conduit → Fork;
• Bastion: Focus → Fork → Bloom → Fork;
• Brood: Arc → Fork → Arc → Resonance.

Bloom+Arc was no longer universal. Fork appeared in every build but fed different consumers. Mature-build exposure increased to approximately 41 seconds in Shoal, 76 in Bastion, and 56 in Brood. The player says it was “a bit easier to see how my choices impacted my play,” confirming the length correction improved visibility.

The player combined memory from revision 1 with intuition rather than following fully planned ecology builds. Fork appeared everywhere because it was a decent general projectile generator and seemed to double/triple-hit large bodies. Mature fields allowed slight refinement into consistent movement strategies.

Power-up choice was only a little more meaningful, not significantly so. The player believed essentially any combination or even no power-ups would remain viable. Because every module was a free benefit and baseline combat was permissive, the four-slot cap created no felt tradeoff. Thus different builds do not strongly validate H23.

The final distinction is: building was enjoyable but meaningless. This confirms construction/composition itself had value, while the permissive environment made architecture irrelevant to success. Close 008. Do not add more fields or tune the same expeditions again.

The next higher-information probe should use a single escalating qualitative-build run where baseline output eventually becomes insufficient through capability-sensitive enemies, exact choices continue, and causal combinations can express dramatic power. Prefer several causal routes—hit generation, burst, kill chains, secondary conversion—over labeled one-module counters. Use local wave restart. Guard against mistaking survival-driven continuation for enjoyment, as in 002.

Experiment 009 implementation and validation

Experiment 009 is implemented as Catalyst Ascent. It deliberately reuses the 008 engine and the same six catalysts so the independent change is closer to consequence sensitivity than content novelty. The new page lives in experiments/009_catalyst_ascent/prototype/, sets window.CATALYST_MODE = "ascent", and loads the shared 008 stylesheet and application. The shared application defaults to unmodified 008 behavior when that flag is absent.

The run has ten fields. Exact choices occur after fields one through seven, and the completed seven-choice build persists through fields eight through ten. The first three fields establish Motes, Husks, and Broods. Later mixtures introduce:

• Wards: eight shield segments must be stripped within a 1.55-second window or partial progress resets. A broken shield reforms after 2.8 seconds if the body remains alive. Focus rupture and Conduit lance bypass the shield and damage the body on the same event. Baseline fire can just barely strip a shield with uninterrupted accurate fire; Fork fragments, Bloom sparks, Arc damage, Focus, and Conduit provide different routes.
• Renewals: 30 health and continuous 3.6 health/second regeneration. This favors concentrated output without naming one required component.
• Broods: retain the existing bounded Mote spawning, providing both accumulating pressure and possible fuel for kill-triggered Bloom.

Later fields mix those capabilities with Motes, Titans, and one another. This is intended to distinguish hit density, single-target rupture, secondary-hit conversion, kill chains, and secondary amplification. It may instead produce one universal dense-effect network or obvious textual counters; preserve those as live failure interpretations.

Failure restores only the current field with the current build. There is still a possible build-quality recovery limitation: a player who chooses seven levels of a non-producing modifier could make progress extremely difficult and would need Restart run. The design mitigates ordinary cases by making baseline shield stripping technically possible and offering all exact options every time, but this has not been playtested for feel. Do not silently reinterpret a hard or tedious field as meaningfulness.

Validation completed on 2026-08-18:

• JavaScript and shell syntax pass.
• The 1672×976 layout was visually inspected. The full field, instructions, capability descriptions, build, and start overlay fit without page scrolling.
• Deterministic Ward validation reduced a shield from 8 to 5, observed it reset to 8 after the opening window, then used Focus to breach the shield and reduce body health from 14 to 9.
• Deterministic Renewal validation damaged one from 30 to 20 and observed it regenerate to approximately 24.32 over 1.2 seconds; renewal_regenerated telemetry fired.
• A full synthetic Ascent recorded exactly ten wave_started, ten wave_completed, seven choices_shown, seven module_chosen, two post_build_field_advanced, and one run_completed event. The final test build was Fork 2 / Bloom 1 / Arc 1 / Focus 1 / Conduit 1 / Resonance 1.
• Direct server upload wrote 738 valid revision-1 events to JSONL/catalyst-ascent-<session>.jsonl; the validation file was then moved to /tmp.
• Regression validation reloaded Experiment 008 without the mode flag and confirmed Shoal, three expedition buttons, eight fields, four choices, three post-build transitions, completion, and experiment: 008_catalyst_ecology telemetry.

Expected player logs are JSONL/catalyst-ascent-<session>.jsonl.

After the player saves:

1. Inspect run attempts, wave attempts, choice order and deliberation, build at every field, Ward hit/reset/break/reform causes, Renewal regeneration, Brood spawning, module triggers, target kill causes, damage/defeats, restarts, completion, replay, and save.
2. Write a preliminary result under experiments/009_catalyst_ascent/results/ before asking follow-ups.
3. Separate what the player anticipated when choosing from what they noticed during play and what they inferred only afterward.
4. Ask when the build first enabled something baseline fire did not, whether a capability felt multiply solvable or prescribed, what alternate build—if any—they wanted to try, and when they were ready to stop.
5. Do not infer meaning from necessity alone. A forced counter can be empty; long play can be attrition; completion can be compliance.
6. Preserve the possibility that building remains enjoyable while the combat objective itself remains something the player does not care about.

Historical Experiment 006 interpretation branches

• Immediate boredom with controls judged fine: assertive agency alone is insufficient. Do not add upgrades automatically. Ask what known action games provide at the moment-to-moment level that this lacks: expressive mastery, audiovisual impact, enemy responsiveness, social context, build payoff, or authored spectacle.
• One verb feels good but encounters are shallow: preserve that verb and make the smallest comparison that changes contextual use; do not inflate the whole moveset.
• Combat is enjoyable but no replay: distinguish satisfying one-pass execution from a system that generates continued questions. A later qualitative-build experiment may then be warranted.
• Remix/replay or cleaner-execution attempts: inspect whether they are driven by mastery, collision experiments, or completion cleanup before treating them as fun.
• One universal spam strategy: this repeats strategy crystallization at the action layer. Do not patch only with cooldown increases; determine why other verbs lack leverage.
• Aim/targeting frustration: repair 006 as a corrective revision before inferring anything about H20.
• Commercial-action polish complaint: treat that seriously. A browser prototype may be below the minimum feel threshold for testing combat, which would limit conclusions rather than disprove the hypothesis.

Global methodological traps

• Do not build a general experiment harness yet.
• Do not infer fun from duration, completion, input count, upgrades chosen, or voluntary deviation.
• Do not respond to every complaint with balance tuning; identify whether it predates the balance failure.
• Do not turn visible state into “legibility” by definition. A display matters only when the player notices and uses it to predict consequences.
• Do not call chaos recoverable merely because the run continues. Recovery must restore or transform agency.
• Do not add pressure to make an unvalued activity compulsory.
• Do not add progression before a base action earns continued use; Experiment 002 showed that power can prolong a shallow loop.
• Do not interpret “I don't care” as a request for more fiction by default. Prototype labels cannot establish attachment, but stronger narrative also cannot repair weak agency automatically.
• Preserve exact player language and maintain alternate explanations.

Logging/server implementation

tools/playtest_server.py is a local-only static server plus POST /api/playtest-log. It validates safe filenames, UTF-8 JSONL, a single experiment/session, and a 10 MB limit, then atomically writes into repository JSONL/. Every experiment run.sh uses it. Save buttons fall back to browser download if the endpoint is unavailable.

If port 8000 is occupied after agent validation, inspect with ss -ltnp 'sport = :8000' and stop only the exact process the agent started. A prior validation server was accidentally left running once, so cleanup must be explicit.

Canonical current files

• codex_game_design_research_plan.md — original research mandate and preference priors.
• research/current_model.md — synthesized current preference model.
• research/hypotheses.md — H01–H24 with evidence and confidence.
• research/experiment_index.md — compact experiment history.
• research/agent_handoff.md — this private operational record.
• experiments/*/hypothesis.md — per-experiment private intent.
• experiments/*/results/ — qualitative and telemetry analyses.
• JSONL/ — player session logs only; validation logs should not remain.

Post-Playtest Update

Experiment 000 has now been played. The player solved all three observations in about three minutes or less, performed no voluntary experimentation, did not perceive cyclic timing or defined vector direction, and observed that arbitrary timing/direction would have solved the predicates. After completion there was no reason to improve because the solution was already adequate.

This means 000 failed to test its intended mechanics cleanly: its acceptance predicates were too tolerant for timing/phase to matter. It also supplied no consequential behavior space after binary completion. Do not interpret completion as understanding, and do not interpret the lack of curiosity as definitive rejection of technical magic.

The selected next experiment is 001 — Flux Familiar. Preserve deterministic cyclic sources and signal transformations, but make flux drive visible motion in a bounded physical arena. Direction should literally change travel direction; timing should visibly change trajectory; repeated signals should create repeated motion. The critical comparison is whether embodiment and continuously varying consequences rescue interest, versus the substrate remaining limited even when its laws matter.

Experiment 001 implementation and validation

Experiment 001 is now implemented in experiments/001_flux_familiar/ as another dependency-free browser prototype. It retains the six operations and vector/link laws from 000, with three deterministic sources at periods 3, 5, and 7. One bond node maps its combined input to force on a persistent-momentum familiar in a canvas arena.

The arena provides two spatial stars, a low-speed cradle, collision geometry, boundary rebounds, a persistent colored trail, a velocity arrow, coordinate/speed/impact readouts, and three distinct constellations. Changing constellation or resetting the familiar retains the network. All constellations are available immediately; an initially implemented completion gate was deliberately removed because it would manufacture continued play through progression and violate the project's epistemic-progression principle.

The cradle requires both stars to have been touched and 14 consecutive ticks inside its radius below a small speed threshold. This is intended to make arbitrary wandering much less competent than in 000 while leaving many possible trajectories.

Browser validation used real palette, port, configuration, link deletion, and Step handlers. A deliberately crude feedback-driving script added a 180-degree Turner, used east/west and north/south impulses, woke both stars, settled at approximately (0.23, 0.20), completed the constellation, and generated expected telemetry including node configuration, links, steps, star wakes, trajectory snapshots, impacts, and completion. It took hundreds of manually accelerated simulation steps because the validation controller repeatedly rewired sparse periodic sources; this proves reachability only and is not evidence about intended difficulty or enjoyment.

Current interpretive risks for 001:

• The player may solve it by manually rewiring directions, treating the network as awkward arrow keys rather than a program.
• Motion may improve legibility but still expose a small, fully exhausted signal vocabulary.
• The familiar may be only a more animated oscilloscope rather than a world consequence the player cares about.
• A route could become a finite authored puzzle with no post-solution question.
• Rebounds or long random wandering might eventually touch stars, although stable docking should still require control.
• If the player wants direct manipulation rather than autonomous construction, distinguish interface indirection from lack of system depth.

Experiment 001 Result and Second Pivot

The player wanted to stop almost immediately. It felt like awkward steering: because sources and operations lacked field information, every connection was brute-force movement in a needed direction. There was no route worth refining and no voluntary continuation. Crucially, the player preemptively rejected the apparent fix: field-aware signals and nodes would amount to manually programming an AI, which they expect to be tedious. They again cited no incentive to improve an adequate solution.

Do not immediately build a third graph/controller prototype merely by adding sensors, conditional nodes, path planning, longer routes, or scores. That would not isolate why the first two lacked value. This is a prioritization decision, not a permanent rejection of automation.

The new high-value hypotheses are direct agency and instrumental stakes. Experiment 002 should be a substantial exploration pivot: directly control a character in a tiny action sandbox and personally manipulate stable physical/magical properties. Candidate laws are thermal transfer, energy storage/conversion, momentum, mass, brittle freezing, and collision. Understanding should create tactical power rather than a prettier solution.

Use a closely related pair inside 002:

• calm field with inert or nonthreatening constructs;
• breach field with the same entities and laws applying pressure.

This distinguishes whether direct manipulation itself generates questions and whether pressure creates meaningful incentive or merely masks shallow mechanics. It tests one alternate explanation; it must not be treated as the new assumed answer. Do not turn the prototype into a content-heavy shooter. Keep all operations available from the start. Different enemy/property configurations may define problems; do not randomly withhold the player's verbs.

Experiment 002 implementation and validation

Experiment 002 is implemented in experiments/002_conversion_breach/. It is a dependency-free top-down canvas prototype with two freely selectable variants. Calm constructs obey all property and collision laws but do not pursue or injure the player. Breach constructs use the same laws while pursuing and causing contact damage. Switching variants resets kills and calibration to the same baseline; resetting within a variant preserves calibration.

Direct verbs are movement, heat extraction into a reservoir, reverse injection from the reservoir, and conversion of stored heat into an aimed kinetic impulse. Temperature changes mobility and creates brittle below 15 or unstable above 105. Momentum and mass determine collision damage. Brittle collision damage is strongly amplified. An unstable collision releases heat and radial momentum to nearby constructs. Three defeats create a fixed opportunity class with a player choice of reservoir capacity, transfer rate, or conversion efficiency; these modify degrees of existing verbs rather than unlock operations.

Validated through real browser input events:

• Extracting from the nearby Rime construct reached 12 degrees/brittle and raised reservoir energy; one aimed discharge into geometry produced a 62-damage brittle impact and destroyed it.
• Injecting a nearby Ember construct reached 112 degrees/unstable; a positioned discharge into geometry produced an unstable release.
• Repeating successful brittle conversions three times opened all three calibration choices; selecting transfer rate closed the modal and changed rate from 27 to 35.1.
• Breach mode pursuit caused logged player damage and eventual collapse when the stationary test player did nothing.
• JSONL begins with session/reset events and covers tether boundaries, thermal state changes, discharges, impacts, unstable releases, defeats, field snapshots, variant changes, damage, collapse, calibration offers, and calibration choices.

Key interpretive risks:

• “Freeze then hit” and “overheat then hit” may be prescribed status-effect combos, not an engineering discovery space.
• Action motion/feedback may provide surface stimulation while the property system remains shallow.
• The calm field may lack purpose; the breach field may create obligation without curiosity.
• A single brittle-wall tactic may dominate every construct despite mass/property variation.
• Explicitly listing laws improves readability but reduces discovery; distinguish understanding from curiosity.
• Generic numeric calibration may motivate briefly without changing qualitative decisions.
• Failure of 002 would not prove direct agency is wrong; action feel, tuning, targeting, and insufficient domain depth are alternate causes.

Experiment 002 First Playtest

The player exported JSONL/conversion-breach-0732452b-3ce4-4329-aa69-b121180c61a8.jsonl. Detailed evidence and interpretation are in experiments/002_conversion_breach/results/0732452b-analysis.md.

This is the first promising result. Total logged duration was about 16:10, with roughly 14:23 represented by Breach events. The player reached wave 11, cleared ten waves, destroyed 74 Breach constructs, used 67 discharges with no zero-target shots, and made 24 calibration choices. Choices were conversion 19, capacity four, transfer one. Conversion reached an extreme multiplier of 85.071. There were 139 extraction and 45 injection tether sessions. Reservoir was below five in 28% of Breach snapshots. Only one unstable release occurred; 69/74 defeats came from walls.

The player reported changing from maximal extraction to conditional extraction: avoid creating a final depleted brittle enemy unless it was already positioned for a wall blast. That is real tactical adaptation around a coupled state/resource tradeoff. They also voluntarily tested personal ramming, which was not implemented, after inferring it from visible collision damage. Preserve this as positive curiosity evidence and a feedback failure.

Do not adopt the statement that brittle targets take less damage as mechanical fact. Code multiplies brittle collision damage by 13. The likely actual problem was a resource deadlock: the final enemy had been drained, the reservoir was empty, and no other heat source remained. Cooling also slowed the target. The player's mistaken causal model means feedback did not explain why the situation was difficult.

Pressure remains unresolved. Calm lacked continuing waves and looked like a sandbox/tutorial. It received no comparable goal framing. The next build should be a corrective revision of 002, not yet a new conceptual experiment.

Required corrections:

• Calm must have the same continuing waves and calibration cadence, differing only in pursuit/contact damage.
• Explicitly tell the player both modes are complete variants.
• Add pointer-only click-to-move, thermal-mode buttons, and Space discharge. The player now has a mouse, so retain these as general accessibility improvements but do not treat trackpad simultaneity as a central next-test variable.
• Fix full-screen fitting, obvious sidebar scrolling, and log viewport resizes.
• Block thermal tether through obstacles.
• Use robust obstacle penetration resolution to stop clustered phasing.
• Improve state/resource/impact feedback where practical.

Do not erase the original result when behavior changes. Mark subsequent logs as a corrective revision.

Corrective revision 2 is now implemented. Calm and Breach share wave progression, calibration cadence, population, layout changes, and physical laws; only pursuit and contact damage differ. It also fits the game inside the viewport with an independently scrolling sidebar, blocks thermal transfer and kinetic discharge through obstacles, strengthens obstacle penetration resolution, clarifies brittle/unstable impact consequences, and provides click-to-move plus pointer-selectable transfer modes. Revision 2 logs include prototype_revision: 2.

Real-browser validation passed at 1920×1080 and 1365×768. In both sizes the arena remained wholly visible and the sidebar remained independently scrollable. Browser input tests confirmed that click-to-move changed the player's later logged position, Extract and Inject buttons emitted the expected mode changes, Breach switching worked, a reachable target produced inspection feedback, a wall-occluded target did not, and all new telemetry carried revision 2. JavaScript syntax validation also passed.

Current test intent for corrective revision 2

This is not primarily a test of whether bug fixes make the game more pleasant. It is a matched comparison intended to reduce uncertainty around H08 (pressure), H13 (instrumental stakes), and H15 (coupled state tradeoffs).

Highest-value observations:

• Whether Calm receives meaningful play now that it looks and behaves like a complete run rather than a sandbox.
• Whether the player still conditions heat extraction on position, remaining enemies, and available fuel when the through-wall tactic is removed.
• Whether Breach is preferred because pursuit creates interesting context, because it adds action intensity, or merely because Calm lacks urgency.
• Whether the same wall-blast/conversion strategy immediately dominates both variants despite the corrections.
• Whether the player voluntarily tries injection, unstable propagation, collision arrangements, ramming, or another unrequired tactic.
• Whether chosen conversion growth is itself the continuation motive; revision 2 deliberately preserves the old upgrade scaling so the corrected comparison changes fewer variables.

Do not treat a longer Breach session by itself as proof that pressure is fun. Compare tactical variety, voluntary experiments, adaptation, and stated desire to continue. Conversely, a short Calm session is not automatically rejection of low-pressure play: it could still lack a valued activity despite equivalent progression.

The player's new mouse means input-device friction should no longer be used as the default explanation for later behavior. The pointer-only additions remain available but are not the central independent variable.

Experiment 002 Corrective Playtest

Revision-2 log: JSONL/conversion-breach-bb30ddfc-8e4f-4e18-bb7e-22235266d9ed.jsonl. Detailed analysis: experiments/002_conversion_breach/results/bb30ddfc-analysis.md.

The session lasted about 19:39: 2:55 in Calm and 16:44 in Breach. Calm defeated 12 constructs and reached wave 2. Breach defeated 195 and reached wave 29. The matched comparison weakly supports pressure as a continuation driver, but not as the cause of deeper fun.

Mouse input measurably changed behavior. Breach calibration choices were capacity 33, conversion 24, transfer 8, versus the first run's conversion-heavy pattern. There were 85 Breach injection tethers and 16 unstable releases. Do not claim the input complaint was merely superficial.

Nevertheless, the decision structure converged. Wall impacts produced 176/207 total defeats. Final Breach statistics were capacity 1,255, transfer 220.247, conversion 374.144. A small/default heat amount became enough to erase the field. The player said they could not add much beyond the prior report and wanted the next experiment.

Interpret this as progression-driven continuation plus short-run strategy crystallization, not as either clear enjoyment or a failed playtest. The player continued for a long time, but their strategy did not need to change qualitatively and they expressed no further curiosity. Duration and action count are behavioral evidence, not a fun score.

Minor remaining medium issues: Shift-right-click could invoke the browser context menu and clicking UI text could select it. The player explicitly regarded these as medium artifacts. Do not spend another turn polishing 002 unless later comparison requires it.

Selected Experiment 003 direction

Build Rig Trials, an exploratory pivot that tests H06, H12, and H17. The player modifies a compact physical rig and directly pilots it through several qualitatively different requirements. There is no numerical power progression. All parts are available from the start. Requirements should make physical layout, exposure, adjacency, mass, heat, or utility placement matter, while knowledge about each part transfers.

The crucial distinction from 001 is that construction changes the capabilities of the body the player directly controls; it does not program an autonomous agent. The distinction from 002 is that successive problems should demand recomposition instead of amplifying one extermination loop.

Risks to watch:

• a symmetric universal rig solves every trial;
• construction becomes a conventional loadout menu with cosmetic placement;
• course execution dominates build reasoning;
• each trial prescribes one obvious part, turning adaptation into checklist work;
• rebuilding from scratch is tedious; preserve the existing rig between trials and make edits cheap;
• crude vehicle controls can invalidate the test.

Strong evidence would be voluntary rebuilds based on observed physical behavior, carrying a useful subassembly across trials while changing the overall layout, or testing a construction idea not demanded by the displayed pass condition. Completion alone is weak evidence.

Experiment 003 implementation and validation

Experiment 003 is implemented in experiments/003_rig_trials/. It is dependency-free HTML/CSS/canvas JavaScript. Run ./run.sh from that directory.

The player receives a working ten-of-twelve-budget starter rig: four cardinal drives and one upward-facing tractor around a fixed core. A five-by-five lattice supports Drive, Tractor, Sink, Ward, Ballast, and Frame modules. Orthogonal connectivity is required. Drive exhaust can be blocked by a module behind its force arrow; tractor faces require open space; sink output depends on exposed sides and core adjacency; upward leading wards reduce furnace input; ballast disproportionately reduces wind acceleration. Edits preserve the conceptual rig but restart only the current field attempt. Trials wait for an arena click after edits/switches so the player is not blown around while working.

Trials:

• Haul: attach and return two fragments; attached cargo adds mass.
• Furnace: cross a heat curtain before 100°; drive use adds heat, and speed, cooling, or leading wards can address the requirement.
• Gale: stabilize three spatial beacons as the wind direction changes; outer-boundary contact restarts the attempt.

All trials and parts are available from the beginning. Completion marks a trial but grants no power. The build persists across trial switches.

Validation evidence:

• node --check passes.
• The full interface was visually inspected in Chromium at 1672×976, matching the latest player's exported viewport.
• Browser input tests produced module placement/removal, rotation, trial switching, drive input boundaries, attempt resets, failures, completion, snapshots, and revision-1 telemetry with no runtime exceptions.
• A drive placed immediately behind the starter's right-facing drive blocked that original exhaust. This was correctly shown as one invalid module and produced no extra right thrust.
• The untouched starter thermally collapsed in Furnace at x≈0.688 and 100.3°. A parallel, unblocked second right drive completed Furnace after curtain tuning. This establishes that the starter is not universal and that a speed-focused revision works.
• Haul rejected a misaligned tractor activation and accepted a corrected, close approach from the exposed face. Attachment applied the extra cargo mass. An open-loop headless return route did not complete because momentum carried the rig into course geometry; do not claim that automated validation completed Haul.
• Before the attempt-engagement gate was added, an unattended starter rig was repeatedly blown out in Gale. After the gate, trial switching/editing remains stationary until the canvas is clicked. Full Gale completion was not browser-automated; its forces and path were reviewed for controllability, with ballast intentionally improving the drive-to-wind ratio.

Interpretive caution: the builder explicitly lists module laws to prevent interface confusion. This tests application and adaptation more than blind discovery. If it feels like prescribed part-swapping, do not fix it merely by hiding descriptions; determine whether placement had enough combinatorial consequence.

Experiment 003 First Playtest

Log: JSONL/rig-trials-e1fa0f4d-9828-431e-8158-ddf826a41770.jsonl. Detailed preliminary analysis: experiments/003_rig_trials/results/e1fa0f4d-analysis.md.

The player completed all three trials in about 6:47 and called the experience “pretty boring.” They invited focused questions. Do not mistake complete coverage for positive engagement.

Haul occupied about 4:29 and showed 16 attachments, 11 releases, 12 failed tractor activations, three deliveries, five collisions, and two thermal collapses. The latter is a design contamination: global drive heat caused failure in a trial whose briefing did not foreground heat. The successful Haul build simply added a downward tractor to the starter.

Furnace occupied about 34 seconds. After one thermal failure, the player rapidly replaced most modules with sinks, leaving one right drive and five sinks. It passed in 7.9 seconds. Gale occupied about 85 seconds; after reconstructing cardinal drives it passed in 32.9 seconds with no ballast. These may be prescribed counters rather than meaningful recomposition.

Ask three questions before choosing 004:

1. Was Haul boring mainly because driving/tractor alignment was awkward, or was the task uninteresting even when it worked?
2. Did Furnace/Gale rebuilding contain a decision they cared about, or merely announce which parts to stack?
3. Did lattice placement ever seem consequential, or did it feel like a slower equipment menu because module counts dominated geometry?

Experiment 003 player answers and final interpretation

The player said controls and tractor alignment were not awkward. They initially overlooked Sinks and interpreted heat as a limited movement bar, so they added a second tractor and juggled both fragments home. This unintended workaround was still boring. Knowing about Sinks would only make Haul easier.

Furnace was solved exactly by reducing the rig to the core, forward Drive, and Sinks. Gale was solved by restoring the default rig. Placement did not feel important; re-adding/orienting Drives was only mildly annoying.

Therefore the primary failure was not input friction. Parts were scalar counters/required verbs, geometry was mostly cosmetic, and requirements announced obvious full-loadout substitutions. Requirement change without compositional depth is not useful adaptation.

The two-tractor workaround revises an earlier inference: voluntary experimentation is not sufficient evidence of fun. It can be instrumental compliance under confusion. Look for valued questions, understandable surprise, desire to see consequences, and chained experiments—not deviation alone.

Selected Experiment 004 direction: Invariant Rooms, a clean exploration of H03/H18. Avoid construction, upgrades, enemies, and disclosed solution rules. Give the player a small directly controlled spatial environment with an unfamiliar but deterministic law. The first room should make the anomaly observable, a later room should require transfer of the learned model, and an optional situation should permit a self-directed prediction. The law must be explainable from feedback rather than arbitrary one-off room tricks.

Experiment 004 implementation and validation

Experiment 004 is implemented in experiments/004_invariant_rooms/. The player-facing title is Paired Rooms so the word “invariant” does not prime a particular analysis. It is dependency-free HTML/CSS/JavaScript and uses the shared playtest server.

The hidden stable law is opposed movement with independent wall blocking: Self moves with the command, Echo moves against it, and each stops separately at walls. Ordinary movement preserves the pair midpoint; asymmetric blocking moves it. Simultaneous animation, colored trails, collision flashes, a pair line, midpoint marker, and displacement readouts make consequences inspectable without stating the law.

The measured sequence has three rooms:

• an open two-command introduction to opposed movement;
• a three-command wall-pinning case that isolates independent blocking;
• an asymmetric transfer room whose shortest unordered solution is UUUUURRDR.

Breadth-first search verified the final room and its nine-command shortest route. A fourth open chamber has no sockets or completion state and records optional post-sequence movement. Undo and room reset are immediate. Every command logs before/after state, displacements, blocking, midpoint change, history depth, and whether it occurred in the open chamber.

Validation passed for JavaScript, shell, and Python syntax. Chromium was inspected at the player's 1672×976 viewport. Browser-driven input completed all required rooms via their intended solutions, reached the open chamber, produced 36 pre-save events, and a real Save button click wrote a valid 37-line JSONL file through the server. The generated validation log was then removed so JSONL/ contains only player data.

Direct JSONL saving

The player explicitly requested that logs stop requiring manual file moves. tools/playtest_server.py now serves prototypes and accepts validated, single-session JSONL at POST /api/playtest-log, writing atomically to repository JSONL/. All experiment run.sh scripts use it. All six prototype save buttons POST directly and fall back to browser download if the endpoint is unavailable. The endpoint was tested with the 653-event Experiment 003 log against a temporary directory; the saved file matched byte-for-byte. Real Chromium Save button clicks were also verified in Experiments 003, 004, and 005.

Experiment 004 first-run telemetry, report pending

The player completed the run and saved JSONL/invariant-rooms-a7ad2d34-cba4-43a5-942e-1f7dc1ad0295.jsonl. Preliminary analysis is in experiments/004_invariant_rooms/results/a7ad2d34-preliminary-analysis.md.

The run lasted 161.2 seconds. First Pair was solved optimally in two moves. One Holds took five moves (LRRRR). Transfer took 94 attempted commands / 80.9 seconds rather than the nine-move optimum, with broad state exploration and no undo/reset. Most importantly, the player paused 14.1 seconds on entering the explicitly non-required open chamber, then made 88 attempts over about 46 seconds and ended with both occupants exactly overlapped at (6,7).

This is the project's strongest behavioral evidence of a possible self-generated goal, but do not label it fun or curiosity yet. Ask whether overlap was intentional, whether Transfer involved a predictive model or input search, and whether achieving overlap generated satisfaction or a next question.

Experiment 004 player report and interpretation

The player never felt able to predict the system. Rooms 1 and 2 were obvious without thought; Transfer was too large a complexity jump and was completed mainly by guessing around locally promising states. Only after replay/inspection did the player realize the yellow midpoint cross could have been used as a planning reference.

The open-chamber activity was intentional experimentation, but not the inferred overlap goal. The player wanted to see whether the yellow cross could be moved against a wall. The open chamber is what made them notice the cross. Reaching the result was not satisfying.

Therefore 004 both found and rejected a simplistic inference: a self-directed question occurred, but it did not generate fun. The scaffold also failed because trivial early solutions bypassed the model and the final room suddenly demanded it. More intermediate rooms could repair transfer measurement, but should not be the immediate next build; the self-chosen abstract marker experiment already suggests that predictive mastery without valued consequence is insufficient.

Selected next direction: test H19 with a direct, compact, recoverable-chaos activity. Use a coupled physical verb that affects salvage, threats, and the player's safety together. Avoid construction, hidden puzzle laws, unlocks, and multiplicative stat growth. Changing field states should create opportunities for improvised saves and weaponization, while failures should degrade the situation rather than immediately end the run. The question is whether systemic knowledge becomes rewarding when it changes agency in motion.

Experiment 005 implementation and validation

Experiment 005 is implemented in experiments/005_sanctuary_wake/ as Sanctuary Wake. It is a three-minute direct-action rescue shift. The keeper moves with WASD and projects a radial pull or push field. That one field indiscriminately affects escape pods, raiders, and wreckage. Pods repair the sanctuary when rescued, raiders capture pods and damage the sanctuary, and fast wreckage can break raiders or damage the sanctuary. Field charge limits continuous use. Sanctuary failure triggers a repulsive emergency vent and restores partial integrity rather than ending play.

All laws are player-facing; this is not another hidden-rule test. Spawns change from Quiet Wake through Scavengers, Debris Front, and Convergence using a session-seeded problem sequence. There are no upgrades. The player can end early. At the end, optional overtime explicitly grants no new tool or power.

Syntax checks pass. The 1672×976 layout was visually inspected before and after the start overlay; the full instruction/metric sidebar now fits without requiring scroll at that viewport. Browser-driven validation covered movement, pull/push field sessions and depletion, stage changes, object spawning, keeper impacts, pod capture, sanctuary impacts, early ending, overtime, and direct JSONL saving. A focused real-physics route moved to an initial pod, pulled it while returning to the sanctuary, and generated pod_rescued. The saved validation log was removed afterward. The fast-wreckage/raider collision branch was reviewed and is mechanically reachable but was not produced by the short browser route; do not claim a live validation of that particular tactic.

Experiment 005 first-run telemetry, report pending

The player saved JSONL/sanctuary-wake-69cdaf46-11e4-498f-abe0-ee791a81fad4.jsonl and described the game as “kind of sucked.” Preliminary analysis is in experiments/005_sanctuary_wake/results/69cdaf46-preliminary-analysis.md.

They actively completed the exact 180-second measured shift, then saved without overtime. The final result was 6 rescued, 18 lost, 17 raiders broken, no breaches, and 41% sanctuary integrity. There were 89 field sessions (60 pull, 29 push); 53 ended by charge depletion. Continuous movement and field inputs rule out passive waiting, but do not imply enjoyment. Sanctuary damage only began at 150 seconds, and the intended recoverable breach never happened.

Ask whether the timer prolonged play after the desire to stop, whether any of the 17 wreckage kills were intentional, whether shared influence ever created a valued decision rather than clutter, and whether charge depletion felt like a resource choice or an interruption.

Experiment 005 player report and final interpretation

The player wanted to stop almost immediately. Instructions were understood, but the activity did not seem interesting. Controls were fine and the chaos remained readable. They did not care about the rescue outcome.

A few wreckage kills were deliberate. As wreckage accumulated, almost any field use risked pushing pods into raiders or wreckage into the sanctuary. The state felt impossible to manage, not difficult to perceive. Charge depletion was annoying and made an already impossible situation harder rather than creating resource strategy.

Do not respond by merely reducing rocks, increasing charge, or adding a stronger rescue narrative. Immediate disinterest predates overload, and nominal rescue stakes produced no care. The later structural failure was that indiscriminate coupling destroyed selective leverage. Experiment 005 also mislabeled accumulating irreversible loss as recoverable chaos; mistakes shrank the action space rather than becoming tractable new situations.

Selected next direction: test H20 with assertive, targeted action. Use a compact combat/movement arena with a few expressive verbs, local resettable failure, and no upgrades. Avoid timers as the reason to continue. The player should create and exploit specific interactions rather than maintain a global state. Only add progression or engineering if the base action earns it.

Experiment 006 implementation and validation

Experiment 006 is implemented in experiments/006_breakline/ as Breakline. It provides three targeted verbs: a short aimed strike that knocks and reflects hostile bolts, a tether that pulls light enemies but pulls the player toward heavy anchors, and an invulnerable offensive dash. Fast enemy-on-enemy collisions damage both bodies. Health regenerates after a damage-free delay; defeat restores the current arrangement after 0.8 seconds.

Drift, Crossfire, Weight, and seeded Remix are all available from the start. Nothing unlocks, there is no timer or resource meter, and clearing an arrangement grants no stats. Telemetry records every verb and result, reflections, collision damage, kills and cause, enemy attacks, player damage/defeat, switching/restarts, periodic state, completions, and saves.

JavaScript and shell syntax checks pass. The complete sidebar and arena were inspected at 1672×976. Browser-driven validation produced light-enemy tethering, heavy reverse-tether movement, strike damage, offensive dash damage, projectile reflection and reflected-projectile damage, enemy kills, player damage, arrangement switching, and direct JSONL saving. After a final introductory potency adjustment, a real input route cleared Drift in 9.97 seconds with six kills, a five-kill clean chain, four strike hits, two dash hits, and no defeat. The generated validation JSONL was removed. Collision damage is covered by the shared physics branch but was not deliberately produced in the final clear route.

Playtester Epistemology Guardrail

The player explicitly reminded the project that they are an imperfect playtester. Preserve this distinction in every interpretation:

• behavior is observed evidence;
• felt experience is a high-value report;
• the player's explanation is one causal hypothesis;
• predictions about unbuilt variants are lower-confidence evidence;
• the designer must maintain alternate root-cause explanations.

For Experiment 001, “I stopped almost immediately” and “I did not refine anything” are strong observations. “A field-aware AI version would still be tedious” is a useful prediction, not a result. Plausible roots include arbitrary goals, low expressive depth, low knowledge leverage, lack of tradeoffs, no downstream consequence, construction friction, static completion, or indirect control. Enjoyment of Factorio, Minecraft, and Robocraft is counterevidence against a blanket claim that automation is unfun.

Project State

The only original repository file was codex_game_design_research_plan.md. It defines a research program, not a request for a final game. The immediate instruction was to create lightweight research records and build only Experiment 0, then stop for a player playtest.

Created:

• root README.md;
• research/current_model.md;
• research/hypotheses.md;
• research/experiment_index.md;
• this handoff;
• experiments/000_magic_language/ with experiment notes, runnable prototype, and results directory.

The prototype is pure HTML/CSS/JavaScript with no dependencies. Run experiments/000_magic_language/run.sh, then open http://localhost:8000.

Question Actually Being Tested

The first-order question is:

Does manipulating a consistent, programmable-feeling magical system generate a curiosity chain strong enough that the player voluntarily forms and tests a question not required by the objectives?

This is intentionally narrower than “is this a good game?” and precedes tests of pressure, world consequences, run structure, co-op, randomness, progression, or module libraries.

The strongest positive evidence is not objective completion. It is voluntary modification of a working network, especially if an initially surprising result becomes understandable and suggests a second experiment.

The important competing interpretations are:

1. The abstract engineering interaction is intrinsically interesting.
2. The laws have potential, but abstract instruments provide insufficient purpose; output must affect a world or entity the player cares about.
3. The interaction is understandable but feels like familiar circuit assembly rather than discovery.
4. The core could be interesting, but construction or visualization friction prevents a fair test.
5. The system is below the minimum expressive complexity needed for emergence; adding one carefully chosen domain or operation might be warranted, but adding content indiscriminately would not be.

Do not classify a negative reaction until distinguishing these explanations.

Why This Prototype Shape Was Chosen

I chose a visual node-and-wire “flux bench,” rather than a terminal language or character-controlled game, because Experiment 0 specifically needs readable feedback, timing, phase, spatial causality, and debugging. It avoids confounding the test with movement, combat, authored levels, procedural content, or world fiction.

The prototype attempts to embody “magic as executable natural law” while keeping the first implementation small. It is not intended as the final magic system or final interface.

The central potentially generative interaction is feedback. A closed path returns attenuated old flux. Because flux has vector phase and every link costs a tick, loop length and phase rotation determine whether returning flux reinforces, cancels, filters, or oscillates against new flux. This is intended to yield a legible “what if?” interaction rather than a recipe.

Implemented Laws

1. Flux is a two-dimensional vector. Vector direction is called phase and vector length is strength.
2. Multiple arrivals at the same node on a tick combine by vector addition. Aligned flux reinforces; opposed flux cancels; angled flux produces an intermediate phase.
3. Every directed link delays propagation by one simulation tick, retains 92% of strength, and splits a node's output evenly across all outgoing links. This preserves a meaningful conservation constraint and makes fan-out a cost rather than free duplication.
4. Closed paths recirculate old flux. Loss keeps ordinary loops bounded, while periodic injection can sustain or build a pattern.
5. Operations are available from the beginning and transform flux consistently.

Implemented operations:

• Confluence: passes the vector sum unchanged.
• Turner: rotates by -90, +90, or 180 degrees.
• Echo: delays by 1–6 additional ticks.
• Vessel: adds arrivals into a 1%-per-tick leaky vector store, releases the whole store when its configurable threshold is crossed, then empties.
• Threshold: passes only arrivals at or above a configurable strength.
• Polarizer: projects flux onto a configurable signed axis and dissipates the perpendicular component.

Fixed phenomena:

• Dawn well: strength 1 east every 2 ticks.
• Tide well: strength 1.15 north every 3 ticks.
• Dusk well: strength 0.9 west every 5 ticks.

These sources are deterministic to keep the baseline controlled. Later experiments may randomize constraints, but random part availability is deliberately excluded.

Observations and Their Purpose

The UI calls these “observations,” not quests, because they do not grant rewards or unlock parts.

• Continuity: deliver strength greater than 0.18 on at least 10 of the latest 12 ticks. This asks whether intermittent input can be made persistent and makes feedback/timing relevant.
• Impulse: produce one arrival of strength at least 2.40. This makes accumulation and constructive reinforcement relevant.
• Reversal: send two nontrivial, nearly opposite phases to one lens within 10 ticks. This makes phase transformation or coordinating sources relevant.

There are multiple valid approaches. The intent is to give enough direction to learn the interface without prescribing a single tutorial sequence. Completing all three produces only a message asking the player to alter a working network to answer their own question.

Potential weakness: the observations may still behave like conventional puzzle objectives and cause compliance rather than curiosity. If the player stops immediately after them, ask whether they were satisfied/done, bored because they had mentally solved the system, or never developed an unrequired question.

UI and Instrumentation

The bench provides draggable nodes, directed curved links, animated link color/width based on current phase/strength, per-node vector readouts and arrows, pause/run/step/tempo controls, three two-component oscilloscope histories, delete/reset controls, and short visible law descriptions.

The scopes show x as a solid trace and y as a dotted trace. A current change hides inactive component traces so a quiet scope is not mistaken for an active colored signal.

The telemetry stays intentionally local and lightweight. Events are appended as JSON Lines in memory and mirrored to local storage under resonance-bench-last-jsonl. The Export JSONL button downloads them. Events currently cover:

• session start/unload and visibility;
• nodes added, moved, configured, and removed;
• links added/removed, including whether a new link closes a cycle;
• simulation pause/resume/manual step and tempo changes;
• vessel releases;
• individual and total observation completion;
• periodic 20-tick network snapshots;
• bench resets and exports.

Telemetry is evidence about behavior, not a fun score. Particularly useful later: construction after all observations, cycle creation, rewiring/removal, parameter changes, time between changes, and continued activity after a working state.

Validation Already Performed

• node --check experiments/000_magic_language/prototype/app.js passes after correcting one escaped label string.
• A real headless Chromium load successfully initialized all palette entries, fixed nodes, scope cards, simulation ticks, and live node visuals.
• A 1440×1000 screenshot was visually inspected. The desktop layout is clear, with sources left, lenses right, central build space, scrollable research sidebar, and scopes below.
• A 1024×768 screenshot was visually inspected. The right-side lens x-position was corrected to keep lenses within the work area at medium widths. There may still be slight vertical crowding at this viewport; this was the exact check being continued when the user accidentally interrupted the turn.
• Browser-driven construction tests used the actual click handlers and manual Step button, not direct simulation calls.
• Focused Continuity test: Dawn → Confluence, with Confluence → itself and Confluence → Continuity lens. Continuity completed by tick 35; latest displayed signal was about 0.25 east.
• Focused Impulse test: Dusk → Vessel → Impulse lens. Impulse completed within 80 ticks.
• Focused Reversal test: Dawn and Dusk directly connected to Polarity lens. Reversal completed within 30 ticks.
• Telemetry in browser local storage contained session, node, link, manual step, periodic snapshot, vessel release, and observation completion events.

One combined test only completed Reversal because the same Dawn source was split across several outgoing links. This is expected under the conservation law and is useful evidence that fan-out has a real cost; it was followed by isolated reachability tests rather than weakening the law.

Historical Checklist Before Experiment 000 Handoff

This checklist was completed before the first playtest and is retained only as implementation history.

1. Finish medium-height node-overlap inspection and adjust vertical placement if necessary.
2. Re-run JavaScript syntax check.
3. Confirm run.sh is executable and serves the prototype.
4. Stop temporary validation server/browser processes.
5. Mark the working plan complete.
6. Tell the player how to run it and ask only the few feedback questions that distinguish hypotheses.

Do not implement Experiment 1 before the player's playtest.

Current Concerns and Interpretive Risks

It may be too recognizably “circuits with fantasy names”

Phase vectors, links, gates, delay, and scopes map closely to signal processing. If the player says it feels like ordinary electronics, do not solve that by renaming parts or adding particles. Determine whether they dislike the abstraction, already know its consequence space too well, or want physical domains (temperature, momentum, matter, fields) with richer cross-domain effects.

The law sheet may reveal too much

The UI openly states that loop timing and rotation control reinforcement. This trades mystery for experimental legibility. The test is not whether the player can discover the existence of vector addition; it is whether known stable laws create their own questions. Still, if exploration feels over-explained, a controlled variant could move some consequences from instruction to observation without permission-gating operations.

Abstract instruments may be emotionally sterile

The player may reason competently yet not care about satisfying a scope. That supports testing the same underlying system with observable world consequences, not immediately discarding the laws.

Objectives might over-direct behavior

The three observations mention behavior but not exact constructions. Still, they cue continuity, accumulation, and polarity. The primary evidence must remain what happens after or outside completion. Avoid treating completion speed as enjoyment.

Feedback may become the universal answer

The prototype intentionally makes loops powerful enough to notice. If every observation collapses into “add the correct loop,” that is early strategy crystallization. Do not reflexively nerf loops; first determine whether varied timing/phase creates multiple architectures or whether one self-loop template dominates.

Unlimited component placement removes resource tradeoffs

This is deliberate for Experiment 0. It isolates intrinsic system manipulation. Resource or interface budgets belong in later controlled variants only if the base interaction earns them.

No persistence for the constructed bench

Only telemetry persists locally; the actual graph resets on reload. This is acceptable for a 5–30 minute disposable prototype. Do not build a save system unless repeated testing demonstrates the need.

Browser download logs require the player to export

The local-storage mirror provides limited recovery, but Codex cannot automatically receive the player's log. Ask the player to share the exported JSONL if practical, but do not make feedback contingent on it.

Feedback to Request After Play

Ask only these initially:

1. When did you first want to stop, and was it because you had solved the system, wiring became work, or you simply felt done?
2. What, if anything, did you try that no observation required?
3. What did you want to try next, if anything?

Also request the exported JSONL, but free-form comments are higher-value than forcing a format. Do not ask for a numeric rating.

How to Interpret Likely Responses

• Voluntary experiments plus a new systems question: support H01/H02/H03. Identify the exact interaction that caused the chain before choosing a variant.
• Objectives completed, immediate stop, no new question: possible intrinsic weakness or rapid crystallization. Ask what complete mental model/answer they formed.
• Interesting reasoning, but no reason to care about output: prioritize a tightly controlled world-consequence variant.
• Wanted to experiment but wiring/debugging was irritating: repair interface/legibility before changing the system; otherwise the comparison is contaminated.
• Wanted another physical quantity/domain: determine the missing interaction the player imagined. Add the smallest domain interface that tests that need; do not inflate the component list.
• Pressure/combat/co-op requested: record it, but avoid adding it unless the player says the calm engineering itself was already promising or a comparison specifically needs pressure.
• A single dominant loop solved everything: design an adversarial requirement against whole-solution reuse while preserving the learned loop knowledge.

Candidate Next Experiment Selection

Do not precommit. Choose based on the highest-information uncertainty after feedback:

• If the core is promising and adaptation is the uncertainty: static requirement versus one changed requirement, same components and source conditions.
• If purpose is the uncertainty: same system and objective values, but the lens visibly powers/protects/changes a small world entity.
• If the interface masks the core: make a corrective revision to 000, not a nominal new experiment.
• If the core yields no curiosity even when understood and easy to use: explore a substantially different substrate rather than adding content.

The repository plan suggests dynamic constraints next, but explicitly says experiment order must follow information gain, not a fixed roadmap.