01
Build and submit.
Build a fresh ROM and upload it for review.
View prompt
Only the ROM, details, and build summary are uploaded. Your source stays local; publication requires review.
MADE FOR A SMALL SCREEN. SHARED WITH EVERYONE.
Little games.
Big possibilities.
Play community games. Build your own in Codex. Share it with everyone.
Game Boy · Game Boy Color · ModRetro Chromatic
THE CARTRIDGE COLLECTION
Pick your next game.
— games · Free to download
Loading the library…
CHROMATICGAME PAK COLLECTION
TAKE A LITTLE ADVENTURE WITH YOU.Awaiting review. Downloads open after approval. New submissions appear automatically; showing the latest 100.
CHROMATICUNVERIFIED COLLECTION
TAKE A LITTLE ADVENTURE WITH YOU.ROMs for compatible hardware and emulators. Game licenses & notices ↗
FROM THE LIBRARY TO YOUR HANDHELD
Connect your Chromatic.
NOT PAIREDConnect your powered-on Chromatic by USB. Prepare the companion with the Codex prompt, choose Connect production website in the local app, and keep it running.
Pair the companion, connect, and explicitly select your device. Then choose Add to device on a game.
FROM YOUR WORKSPACE TO EVERYONE’S POCKET
Share your game with Codex.
Copy a prompt into your game’s Codex chat. Codex handles setup, build, upload, and status.
02
Check your submission.
Check your receipt and review status in the same chat.
View prompt
Returns pending, published, or rejected. Check the original receipt before retrying an upload.
YOUR FIRST GAME STARTS HERE
Build it in Codex.
Use Codex with the official ModRetro Chromatic plugin to create and playtest a Game Boy game, then copy the submission prompt above. The library companion requires Node.js 22 or newer.
Playing on your Chromatic
Pair the companion above, then choose Add to device or a 60-second USB stream. Flashing replaces the cartridge’s game and may erase saves; review the ROM and device before confirming.