A typical game of tic-tac-toe
Tic-tac-toe is a popular pen and paper game. The game utilizes a 3x3 grid using the letters X and O to fill them. If a player gets three in a row (verically, horizontally, diagonally) of his or her own letter, that player is the winner. Games of tic-tac-toe generally end up in a draw.
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