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Tic-tac-toe is a quick and easy game for two players who take turns marking the spaces in a 3×3 grid.
The first player marks their squares with x's, and the second player marks their squares with o's.
The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row wins the game.
Numerical Tic Tac Toe is a variation invented by the mathematician Ronald Graham. The numbers 1 to 10 are used in this game instead of x's and o's.
The first player (Player x) plays with the odd numbers, the second player (Player o) plays with the even numbers. All numbers can be used only once.
The player who puts down a 3rd number in a line which adds up to 15 wins!
Hint: You'll want to keep track of which numbers you and your opponent have left, and make plays using each other's placed numbers.