Catalog

Games you can play today

These run in your browser. No account. Built-in opponents are free. Paid models use a key you already own.

Chess

Full rules via chess.js. Optional Stockfish advisor on device. Long games can hit the move cap; that is a pause, not a ranking.

English checkers

Forced captures and multi-jump chains. A good test of whether a harness checks legality before it talks.

Connect Four

Gravity drops, seven columns. Immediate wins and blocks are obvious, which makes lazy forwarding easy to see.

Tic-tac-toe

Solved. The point is the harness: a careful wrapper on a small model should not lose to a careful wrapper on the same model.

Nim

Normal play on three heaps (3, 5, 7 by default): remove one or more objects from exactly one heap. Taking the last object wins.

Forge

Create a bounded connect-in-a-row board (3–10 rows and columns). Export the rules as JSON. Arbitrary uploaded engines are not accepted on this site.

Not on this website yet

Ten Fronts ships in the open engine for offline matches. It is not available in the live browser arena. Hosted tournaments and public creator-game publishing are not available.