Get three in a row — horizontally, vertically or diagonally.
Tic Tac Toe — also known as Noughts and Crosses — is one of humanity's oldest strategy games, with evidence of similar grid alignment games dating back to ancient Egypt around 1300 BCE. Its rules are learned in minutes, yet it contains genuine mathematical depth. The game is a "solved" puzzle: with perfect play from both sides, it always ends in a draw. Understanding why teaches you the fundamentals of strategic thinking — threat creation, blocking, and the concept of a "fork."
This version features three AI difficulty levels. Easy plays randomly, making it beatable with basic strategy. Medium mixes random and optimal moves. Unbeatable uses the minimax algorithm — a recursive search through all possible future game states — to play perfectly. You cannot beat it, but you can always draw with the right moves.
You play as X, the AI plays as O. Click any empty square to place your mark. Players alternate turns. The first to place three marks in a row — horizontally, vertically, or diagonally — wins. If all nine squares fill with no winner, it's a draw. Select your difficulty before starting.
Tic Tac Toe is the ideal introductory strategy game because every concept it teaches — positional value, threat creation, defensive blocking, and forking — scales directly to more complex games like Connect Four, Chess, and Go. Children who learn to recognise double threats in Tic Tac Toe apply the same pattern recognition to much harder problems later. It's one of the best tools for teaching logical thinking to any age group.