Twenty classic games. Real AI opponents. Free, in your browser.
PlayVersusAI started as a passion project with a simple idea: build AI opponents worthy of your time for the games you grew up loving. Too many online board games treat single-player as an afterthought, offering AI that either plays randomly or plays so perfectly it feels unfair. We wanted something in between — opponents that challenge you, scale to your skill level, and genuinely help you become a better player.
That idea has grown into a library of twenty games: strategy board games with serious AI engines, card games, and a set of puzzle and arcade classics with global high-score leaderboards. Thirteen of the games also support real-time online multiplayer, so when you're done sparring with the AI you can challenge a friend with a room code.
Everything runs directly in your browser. No downloads, no accounts required to play, no paywalls — an account is only needed if you want your wins and scores on the leaderboards.
From deep strategy to five-minute coffee-break puzzles:
Every game has its own how-to-play and strategy guide, and a new daily word puzzle drops every midnight — the same word for everyone, so you can compare with friends.
We didn't take shortcuts with the AI engines. Each strategy game uses established game-theory algorithms, implemented and optimized to run at full speed in your browser.
Connect 4 uses a bitboard representation — the whole board encoded in a pair of 64-bit integers — driving a negamax search that evaluates millions of positions per second. Chess runs minimax with alpha-beta pruning, move ordering, and a hand-tuned positional evaluation. Checkers, Reversi, Mancala, Gomoku, Nine Men's Morris and the other board games each get their own search engine with evaluation functions built around that game's actual strategy: mobility and corner control in Reversi, threat patterns in Gomoku, chain parity in Dots and Boxes, pip counts in Backgammon, probability-density targeting in Battleship.
On AI Training difficulty, the engines use time-limited iterative deepening: they search progressively deeper until a strict time budget runs out, producing the strongest move they can find within a fair window. Easy and Medium difficulties deliberately limit search depth and add controlled imperfection, because an opponent you can sometimes beat is an opponent you learn from.
Thirteen games support live player-vs-player matches. Create a match in the multiplayer lobby, share the room code (or a direct link), and moves sync in real time. No install, no friend lists to manage — a code is all it takes.
On our four original games — Connect 4, Checkers, Reversi, and Mancala — you can toggle Coach Mode for live move recommendations, and get a full post-game review that rates every move from Great to Blunder and shows the line of best play from any position. It's the fastest way we know to actually improve, and we're working on bringing it to more games.
We're a small team building something we genuinely love. Ideas, bug reports, game requests, or just saying hello — we read everything, and player feedback directly shapes what we build next.
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