About Infinite Tic-Tac-Toe
Infinite Tic-Tac-Toe (Infinite TTT) is a free, browser-based multiplayer tic-tac-toe game with two unique modes — Sliding (marks disappear after three placements, eliminating draws) and Expanding (board grows from 3×3 to 5×5 across rounds) — plus ranked Elo matchmaking, AI practice bots, friend challenges, private rooms, live spectating, and match replays.
Game Modes
Sliding Mode uses a fixed 3×3 board where marks slide off after three placements per player, preventing stalemates. Expanding Mode uses round-based play on progressively larger boards where the win condition scales with board size.
- Sliding Mode — dynamic 3×3 board where marks disappear after three placements per player. No draws possible.
- Expanding Mode — round-based play on boards that grow from 3×3 to 5×5 each round.
Competitive Play
Ranked matches use an Elo-style rating system. Every player starts at 200 rating and earns Bronze at 400, then climbs through Silver, Gold, Platinum, Diamond and Master to Grandmaster at 3000. Wins against higher-rated opponents award more points than wins against lower-rated ones, and each mode carries its own separate rating.
Free to Play
Yes. Infinite Tic-Tac-Toe is completely free to play in your browser with no download. You can play quick matches, ranked matches, AI practice and two-player games on one device without an account. Signing in is only needed for features that have to persist across devices — private rooms, the friends list, direct challenges and profile history.
Features
- Real-time online multiplayer
- Ranked Elo matchmaking and global leaderboard
- AI practice bots with adjustable difficulty
- Friend challenges and private room invites
- Match replays and live spectating
- Progressive Web App — works on desktop and mobile