The original zero-shot build. The crux here was not physics but twin-stick input (gamepad plus mouse), horde management, and progression feel. Passed headless QA on 2026-07-18: no console errors, twin-stick gamepad mapping verified (left stick move, right stick aim and fire), mouse and WASD verified, combat kills enemies, XP to level-up to upgrade flow works, player death to game over works, and an 8-second horde run stayed bounded with no NaN. Canvas render sanity-checked during play. INCOMPLETE — this generation never finished Phase 5 (Polish & Ship). Its audio is still the placeholder stub (the file is literally commented 'placeholder stub — replaced by the Audio department'); the Audio department never delivered, and the source has not been modified since QA. The game was also never committed to the workspace repository, never registered in the static launcher's GAMES array, and ships no README of its own. Treat it as playable but unlanded.

The original zero-shot build. A custom rigid-body simulation: a chassis with two wheels doing spin-based traction (friction opposes the slip between tyre surface speed and ground), wheelies from a rider weight-shift model, free rigid-body air rotation under lean torque, suspension that absorbs landings, and crash rules. Heightfield terrain sub-stepped at 1/240s so fast wheels cannot tunnel on steep faces. The Audio department synthesized a continuous throttle-tracking engine plus landing/crash/finish sounds procedurally via Web Audio. QA'd against headless physics tests (settles at rest, accelerates and rolls, pops wheelies, flips in the air, all demo tracks completable) plus editor round-trip checks.

The original zero-shot build. A Physics R&D pass produced the SI reference the engine implements; an Audio department synthesized all sound procedurally via the Web Audio API; the core was authored and QA'd against headless physics tests — draw reverses the cue ball, follow drives it through, breaks settle, nothing tunnels or sticks.