Think you've mastered tic-tac-toe? Think again.

Ultimate Tic-Tac-Toe is the strategic big brother of the classic game: nine small boards inside one giant board. Every move you make decides where your opponent must play next — so you're always thinking two, three, four moves ahead. Easy to learn, genuinely hard to master.

HOW IT WORKS
• Win a small board to claim that square on the big board.
• The square you play in sends your opponent to the matching big board.
• Win three big squares in a row or a diagonal to win the game.

GAME MODES
• Vs AI — three difficulties:
- Easy: relaxed and beginner-friendly
- Intermediate: a sharp, tactical opponent
- Hard: a minimax AI that searches four moves ahead and punishes mistakes
• 2 Players — pass-and-play on a single device, unlimited and free.
• Daily Challenge — a fresh pre-placed puzzle every day against the Hard AI, free and unlimited. The board ADAPTS to your skill: drop a couple of games and it tilts in your favor; rip off a winning streak and it tilts back.

FEATURES
• Clean, modern interface with light and dark themes
• Detailed stats: win rate, streaks, fastest and average game times
• Sound effects you can switch off and that play alongside your own music
• No ads, anywhere in the app
• No account required — just open and play

FREE AND FULL VERSION
Free play includes the Daily Challenge, unlimited two-player, and two AI games a day on Easy or Intermediate.

The Full Version is a single $1.99 purchase — not a subscription — and unlocks unlimited AI games plus Hard Mode. Buy it once and it is yours on any device signed in to the same account.

Download now, claim your first board, and find out how deep tic-tac-toe really goes.