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It's true--playing with numbers can raise your I.Q., and help you think more clearly! The most popular numbers games are math puzzles, and you've come to the right place to find 100 examples of the best. Here's an example: Find the shortcut for adding 2, 3, and 4 to form 6 different 3-digit numbers. Or, try this one: What is the smallest number that when multiplied by 3 gives an answer consisting of all 4's? Other games and puzzles involve flipping coins, burning candles, and taking apart a Rubik's cube in your head. (There's also a puzzle called Cubic's Rube.) Still others challenge you to nab a thief based on his lies, and figure out how a sheep survives in a pen with 16 very hungry but very logical lions, but would be eaten quickly if there were only 15.