Ages 5 and up
This strategy board game has become something of a sensation, winning a Teacher's Choice Award and a Mensa Select Award. The goal is to fit all your differently shaped pieces onto the board -- a task that draws on spatial reasoning and logic. Invented by a mathematician, Blokus draws on the stuff of geometry class, without feeling like, well, homework. In fact, elementary school kids can play long before they've officially waded into proofs and postulates; we like to think it whets the appetite for what's ahead. Suitable for adults as well as kids. Think Tetris, on a board, without the mind-destroying music.
The bottom line: Challenging and fun for adults as well as kids. Like Tetris but better.