Tic-tac-toe, and a bunch of its friends.
X's turn
Pick a game
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The classic. Three in a row wins.
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Same board, but three in a row loses.
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Everybody plays X. Don't be the one who finishes a line.
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Play an X or an O, whichever you like, every turn.
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One long strip, and both players play X. First to make three in a row wins.
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Three pieces each. Once they're down, slide them.
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Drop pieces down the columns. Four in a row wins.
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Nine boards in one. Where you play sends your opponent.