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.)

Cautioning that his two-piece puzzle has a "dead end" that you might get caught in, Professor Mind Muddler advises that you go back to the starting position and try again to get the pieces of the Nipper Puzzle apart.