Tic-Tac-Toe
X vs O. You vs a clever AI.
About Tic-Tac-Toe
Tic-Tac-Toe (noughts and crosses) is the world's most famous pen-and-paper game, now playable free in your browser. Take on a computer opponent with three difficulty levels — from a casual rookie to an unbeatable strategist powered by the minimax algorithm — or pass the device and play a friend in two-player mode. Line up three X's or O's in a row, column, or diagonal to win. Quick rounds, running score tally, and that eternal question: can you outsmart a perfect player?
How to play Tic-Tac-Toe
- 1You play X; tap any empty square to make your move.
- 2The AI (or your friend in 2-player mode) places O.
- 3Get three of your marks in a row — horizontally, vertically, or diagonally — to win.
- 4If all nine squares fill with no winner, it's a draw.
- 5Score is tallied across rounds — play a best-of series!
Tips & strategy
- Take the center first — it's part of 4 possible winning lines.
- Corners beat edges: each corner joins 3 winning lines, edges only 2.
- Create a 'fork' — two winning threats at once — and you can't be stopped.
- Against Impossible difficulty, perfect play always ends in a draw. Prove it!
Frequently asked questions
Can I beat the Impossible AI?
No — it plays mathematically perfect moves using minimax. The best possible result is a draw, which is itself a win for you!
Can two players play on one device?
Yes — switch to 2-player mode and take turns on the same screen.
Who goes first in Tic-Tac-Toe?
X always moves first. On FunNudge you play X by default, so you get the first-move advantage.