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3D Tic Tac Toe is played on a 3x3x3 grid. The goal is to get three of your marks in a row, which can be aligned horizontally, vertically, or diagonally across the three dimensions. Players take turns placing their marks in any empty cell. A player wins by placing three marks in a row along any straight line in the 3D grid. If all cells are filled and no player has three in a row, the game ends in a draw. It's a fun and strategic twist on the classic game.