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There are no dice, no cards, no random elements anywhere in tic tac toe. So why does it sometimes feel like luck? Here is the real answer.

No phone, no wifi, no board needed. Here are 10 pen and paper games that are genuinely fun, from five-second classics to games that can last an hour.

The Hard mode on TicToe.org cannot be beaten, not even once. Here is how the minimax algorithm works and why it guarantees a perfect game every time.

Bored and not sure what to play? Here are the best browser games you can open right now with no download, no sign-up, and no waiting. Jump straight in.

Tic tac toe is solved. Perfect play always ends in a draw. So why do billions of people keep playing it? The answer turns out to be surprisingly interesting.