This is a Tic Tac Toe game, where two 'players' are matched in order of arrival. Once you have an opponent, you can take turns playing.
Click on a block to select it (it will turn yellow). Then press either the 'X' or the 'O' key and its letter will be shown in the block. You then wait for your opponent to make a move, which will show up automatically. If you complete a row, column or diagonal with the same letter, it will turn orange and there is a winner.
Press the Esc-key to quit the game.
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