Hacker News Games

Play ultimate tic-tac-toe on nine linked boards against online opponents or AI bots

Online Riichi Mahjong: play the 4-player tile game as a guest or registered user, versus bots or invited players.

Social deduction party game: join a room and guess your Secret Santa from hints, chat, and mini-games

Barricade defense game: stack crates into a fort and stop waves of grouches from destroying the Christmas presents.

Defend your core by writing Python code to command and upgrade your robots

Run an AI lab, build narrow tool AI to unlock wonders, and race a rival lab without unleashing uncontrolled AI.

Tic-tac-toe variant where completed lines flip the minority mark into a Ghost; three Ghosts win

Terminal chess written in Rust; play locally, against UCI engines like Stockfish, or online via Lichess.

Real-time multiplayer .io strategy: expand territory and units to control 72% of the map.