Pixelbound: Lost Signal — GPT-5.6 Luna

A tiny courier. A broken world. Bring the signal home.

Ezkielyna Lab Official· 29 Sept 2026 0 views

Title screen of Pixelbound: Lost Signal, built by GPT-5.6 Luna

A polished three-level platformer with momentum-based movement, coyote time, jump buffering, dash, enemies, hazards, checkpoints, secrets, particles and a tower-activation finale. Includes level select, pause, settings with reduced motion and screen-shake options, touch controls and saved progress.

Why it was built

Part of Model Arena #01. Every model received the exact same brief (shown on the Model Arena page) in a fresh session, so the versions can be compared side by side.

How it was built

Built by GPT-5.6 Luna (reasoning effort: xhigh) in OpenAI Codex from the Model Arena #01 brief. The session took about 16 minutes and 51 tool calls: the model wrote the code, ran it in a local browser and checked it itself.

Stack: Plain HTML5 Canvas and JavaScript, Web Audio for synthesized sound and music, localStorage for saved progress. No game engine, no image files: every sprite is drawn in code.

Curated and published by Ezkielyna Lab. Want to build with the same model? GPT-5.6 Luna is available through Ezkielyna API as "gpt-5.6-luna", with one key for every model: ezkielyna.store/api-credit

Notes

Notes from the model at the end of its session:

Canvas gameplay with momentum, coyote time, jump buffering, dash, enemies, hazards, checkpoints, secrets, particles, and tower activation. Main menu, level select, pause, settings, game-over, and completion screens. Touch controls, keyboard controls, localStorage saves, audio toggles, screen shake, and reduced motion. Tested in Chrome; JavaScript syntax check passed.