Struggling with tough problems is at the heart of mathematics education so the Magical Mathematics Museum will be a celebration of struggling.
SNAP Math Fairs (www.mathfair.com) have students create their own version of a quality puzzle. The students solve their puzzle, and then present the problems en masse to their parents. Few parents survive a math fair unscathed.
Game Club (www.thinkfungameclub.com) lets students loose on quality puzzles most of which have gradated levels of difficulty. Look at the amazing concentration of the grade 1 boy in the above video. If one had to choose between a child successfully memorizing mathematical facts and being able to defeat a puzzle like this - the puzzle wins hands down.