Fun and games
Tic Tac Toe
Play head-to-head on one device or switch on computer mode for an unbeatable AI. Scoreboards stay saved locally, rematches are instant, and number keys 1 through 9 can place moves if you prefer the keyboard.
Mode
Your mark
Tic Tac Toe
Tic Tac Toe plays against an unbeatable computer opponent or a second player, with score tracking.
How to use it
- Choose single player or two player.
- Take turns placing your mark.
- Get three in a row to win.
A solved game
Tic tac toe is solved, meaning the outcome with perfect play from both sides is known: it is always a draw. The unbeatable opponent uses that. It will never lose, and it will win only if you make a mistake.
The strategy fits in a few rules. Take a win if available, block the opponent's win if not, then take the centre, then a corner, then an edge. The centre is the strongest opening square because it sits on four of the eight winning lines, while a corner sits on three and an edge only two.
When it helps
- A quick game against a real opponent or the computer.
- Teaching a child their first strategy game.
- Demonstrating what a solved game means.
- Learning why the centre square matters.
Common mistakes
- Opening on an edge, which is the weakest first move.
- Chasing your own three in a row while ignoring the opponent's.
- Expecting to beat perfect play. A draw is the best result available.
