Think you can separate these clever metal links, and then put them back together? Think again! Made from heavy, chromed steel and bent into brain-twisting shapes, these Puzzle Club puzzles for ages 8 and up are downright fiendish. Each is presented in a colorful gift box with a different cartoon genius offering a bit of encouragement. (Not recommended for children under 3.)

His puzzle might be easy to take apart, cautions Professor Master Mind, but putting it back together is the real challenge—so tricky, in fact, that he rates the difficulty level as "Extreme."