TicTacToku

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About this game

TicTacToku fuses two classic games into one fast, competitive puzzle.

**THE TWIST**
The board is a 9x9 Sudoku grid split into 9 boxes — and each box doubles as a square on a Tic-Tac-Toe board. Solve a box correctly (valid Sudoku digits, 1-9) and it's yours. Claim three boxes in a row, column, or diagonal before your opponent does, and you win the match.

**HOW A MATCH WORKS**
- Race Mode: you and an opponent solve the same puzzle at the same time, each
on your own private board.
- Every box you complete is claimed with an X or an O.
- First to three claimed boxes in a row wins — even if your Sudoku isn't
finished yet.
- No human around? Play a computer opponent anytime.

**PLAY YOUR WAY**
- Jump in instantly as a guest, no account needed.
- Sign in with Google to keep your name and stats across devices.
- Ranked matches track an ELO rating, so every win means something.
- Climb the global leaderboard and see how you stack up.

**BUILT FOR FAIRNESS**
Every move is validated on our servers, not just trusted from your device, so matches stay fair from the first cell to the last box.

**FREE TO PLAY**
TicTacToku is free, with lightweight ads supporting development. No pay-to-win, no loot boxes — just a fast, sharp puzzle battle.

Quick to learn if you know Sudoku. Impossible to master when someone's racing you on the same grid.

What’s new

Introducing TicTacToku — multiplayer Sudoku meets Tic-Tac-Toe. Race an opponent to complete Sudoku boxes; claim three in a row to win. Play as a guest or sign in with Google to keep your name and stats. Ranked matches with ELO and a global leaderboard.