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Read articles, including Science News stories written for ages 9-14, on the SNK website.
Tic-tac-toe many times over

The Density Hales-Jewett Theorem concerns a high-dimensional version of tic-tac-toe on large grids. This video game for an iPod uses a three-dimensional tic-tac-toe board with a grid of size 4. Credit: http://www.agileapps.ca/

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