Codex Pet Arena
Import your Codex pets and climb the Alpha ranked arena.
Upload pet files, tune a build, unlock passive paths, and watch seeded battles play out with persistent ranked progression.
Pet stable
Sign in
Imported fighters appear here after GitHub sign-in.
Ranked season
Alpha
Server-selected ranked matches, ratings, and reward tiers are live.
Battle engine
Seeded
Every fight produces deterministic animated replay logs.
Import a Codex pet
Uploads are treated as untrusted files and validated server-side.
Import uses `pet.json` and `spritesheet.webp`. Codex pet files are usually under `%USERPROFILE%\.codex\pets` on Windows and `~/.codex/pets` on macOS/Linux. You can also check Codex pet settings for the active pet folder.
Sign in with GitHub to enable pet imports.