If your problem-solving prowess causes jigsaws, gyroscopes, and multi-colored cubes to lose their mystique, you're ready for the Wise Guy and Smarty Pants. This intermediate- and difficult-level mind-benders are inspired by centuries-old designs with avid puzzlers like you in mind. To maintain that untarnished brainteaser taming rep, you'll have to remove an iron ring held captive within a shifting fortress of a dozen unforgiving steel shapes. No brute force or trickery is needed here; only patience, wits, and plenty of out-of-the-box thinking. Whether it takes you minutes, hours, or even years to solve, both disentanglement pieces are a mechanical obsession you'll love to loathe.