You take it in turns to eat chomps out of a chocolate bar but the person who finishes it first loses. A mathematically rich and interesting game you can play against a friend or the computer.

This nifty little freeware program plays the game chomp against you. You have to avoid finishing a rectangular chocolate bar as you take turns to eat rectangular bites from the bottom right hand corner. There is nothing to install (or uninstall), just run the exe.

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