Play Ultimate Tic-Tac-Toe free online vs a smart CPU. Nine boards in one — your move sends the opponent to the matching board. Win three boards in a row to win.
Tap a cell in the highlighted board. Your cell sends the CPU to the matching board. Win a board for three-in-a-row; win three boards in a row to win the game.
Ultimate Tic-Tac-Toe takes the game everyone knows and folds it into itself. The board is a 3×3 grid of nine smaller tic-tac-toe boards, and to win you must claim three of those small boards in a row. Suddenly the childhood game that always ends in a draw becomes a genuine battle of foresight, traps and tempo against the CPU.
The twist that makes it sing is where your move sends your opponent. Whichever cell you play inside a small board decides which board they must play in next — play the top-right square and they're forced into the top-right board. So every move is two decisions at once: the mark you make, and the board you hand over. Send your rival somewhere harmless, and avoid gifting them a board they can win.
It runs instantly in your browser on phone, tablet or desktop — no download, no sign-up, completely free. The active board is highlighted so you always know where you can play; just tap a cell. The CPU thinks a move ahead, grabbing boards and dodging gifts, so beating it means controlling where the game flows. Easy to learn, surprisingly deep to master.
Tap a cell in the highlighted board to place your mark. The cell you choose sends the CPU to the matching small board for its turn. Win three cells in a row to claim a small board, and claim three small boards in a row to win the game.
You must play in the board that matches the last cell your opponent played — that board is highlighted. If it's already won or completely full, you get a free move and may play in any open board.
Claim three small boards in a row — horizontally, vertically or diagonally — on the big 3×3 grid. You claim a small board by getting three of your marks in a row inside it.
If a small board fills up with no three-in-a-row, it's neutral — it counts for neither player toward the big grid and can no longer be played in.
The CPU looks one move ahead: it takes boards it can win, blocks your wins, and avoids sending you somewhere you could win a board. It's a solid casual opponent — beat it by steering where the game goes.
Completely free, with no install or sign-up, and built mobile-first: the active board is clearly highlighted and cells are comfortably tappable on any screen size.