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.)

Even if you get his Claws Puzzle apart, notes Professor Brain Baffler, there are two ways of putting it back together—and the solution changes slightly depending on which way they're linked.