This variation of Tic Tac Toe develops students' strategic thinking. Two players, one using 1s and the other using 0s, take turns entering their numbers into the cells of a 3 by 3 grid. The winner is the first to complete three in a row with an odd sum. The game can be played on paper with a friend or against the computer with the interactive applet. The interactive version allows a user to choose which number to play with and whether to go first or second, providing an opportunity to refine strategy by reflecting on how these choices affect the outcome.


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