Looking to keep your child busy while you try to relax this holiday season? ThinkFun has created "the world's most challenging puzzle", called 36 CUBE for ages 8 to adult. Your goal is to place the 36 colored towers onto the puzzle base following two simple rules: there must be one and only one of each colored tower in each row and column, and the towers must fit in the base to form a perfect cube shape with all towers at the same height. Mathematicians and puzzle experts agree that, with the number of possible solutions reaching the qudrillions, 36 CUBE seems unsolvable. However, a solution does exist that is unexpected and not based on reason alone. Go online to try the game yourself and see how many towers YOU can place before you get stuck. MSRP: $25.00 . Pick it up Amazon.com.

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