Build a 3D Sonic-style platformer in three.js

Task prompt given to the agent (headless, offline, synthetic fixture inputs): In one pass, build a small 3D Sonic-style platformer as a single file index.html using three.js from https://unpkg.com/three@0.160.0/build/three.module.js (ES module import). Requirements: a player character that runs with arrow keys or WASD and jumps with Space; a third-person camera that follows the player; at least 20 collectible rings that raise a ring counter in a HUD; at least 3 floating platforms; a speed boost pad; a goal at the end that shows a "You win" message; falling off the level respawns the player. No other files. Inspired by https://x.com/cherry_mx_reds/status/2104597898998460813 (unverified; not checked with the author). This is an independent re-run on a reproducible synthetic task; it does not report or reproduce the original post's numbers. Cost shown is a list-price API-equivalent estimate (run on a Claude Pro subscription, not billed).

Success criteria: All automated rubric checks pass: imports three@0.160.0 module; no uncaught console errors in headless Chrome; Space jump; arrow/WASD; ring counter HUD; >=20 rings (count literal); boost pad; win message; respawn on fall.

Best model for this task so far: Gemma 4 31B Instruct (Venice) (success, $0.0037, 3m). Best AI model for Games & Simulations →

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All runs (9)

88% pass rate across 8 eligible runs: 7 pass, 0 partial, 1 fail. Partial and failed runs are listed below with everything else.ⓘ