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Think outside the box! Card Shark, Marble Madness, Sock It to Me! & Dizzy Walk In the beginning there's "Jewels of Xanadu" on the cover--where the chances of unlocking the special color-coded safe could be 1 in millions or 1 in 64, depending on where you start. And once you've survived that, another 25 mind-stretching puzzles await. Win a coin-toss game with three friends, calculate the real odds of winning the lottery, predict the chance of pulling the one green marble out of a box of red ones. Think like a mathematician, making sense of seemingly random events. Bring a pencil, but remember--(1) you don't have to be a whiz to play, because (2) the most important skills you'll need are curiosity and an open mind. (Solutions and explanations are provided of course!)