Pixelbound: Lost Signal — GPT-5.6 Sol

A tiny courier. A fractured world. One signal left to find.

Ezkielyna Lab Official· 29 Sept 2026 1 view

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

Three distinct levels with moving, falling and phase platforms, bounce pads and secrets. Variable jump height, coyote time, jump buffering and dash, plus procedural sound effects and music, accessible menus and automated gameplay smoke tests covering all three levels.

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 Sol (reasoning effort: xhigh) in OpenAI Codex from the Model Arena #01 brief. The session took about 18 minutes and 55 tool calls: the model wrote the code, ran it in a local browser and checked it itself.

Stack: Plain HTML5 Canvas and JavaScript, split into ES modules, 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 Sol is available through Ezkielyna API as "gpt-5.6-sol", with one key for every model: ezkielyna.store/api-credit

Notes

Notes from the model at the end of its session:

Three distinct playable levels; responsive movement with coyote time, jump buffering, variable jumps and dash; enemies, hazards, moving/falling/phase platforms, bounce pads, secrets and checkpoints; collectibles, health, respawn, completion screens and saved progress; procedural sound effects and music; desktop and touch controls; accessible menus and functional settings; automated gameplay smoke tests covering all three levels.