Decision Arena

Decision Arena is an open-source web playground for decision models. Play Gomoku, Xiangqi, Army Chess, Snake, Tetris, and an original platform game. Control the game yourself, challenge an AI, or compare independently configured models. Connect Jev via OpenRouter Decisions, StartLux via System One, or another supported compatible decision endpoint, using your own API key. The game engine supplies the current observation and candidate actions; the model chooses an action, and the engine validates and applies it. Match records preserve decisions, timing, and results. Completed matches remain private until you choose to publish a community replay. The code is MIT-licensed and can be self-hosted. AI play uses your own provider account and may incur model charges; the application includes no shared model key. A locally running model can be connected through a supported compatible endpoint, but the hosted service requires a reachable authenticated public HTTPS endpoint. This is a game playground for exploring model behavior, not a standardized model benchmark. This listing was checked against public pages and documentation; no games or model calls were run for this review.