TrueBalance and TrueChallenge put the balancing, twisting fun in your hands. And once you pick up one of these puzzle-meets-toys, you won’t want to put it down. Makers Henrik Deterberg and his daughter Linea invented TrueBalance as a rehabilitative tool for folks recovering from brain injuries and strokes. While it did the job of working fine motor skills, the Deterberg’s learned others were simply playing with it for fun. The handheld balancing toy-meets-brain teaser is endlessly fun. The objective is to get the rotating magnetic discs to stack up. Sounds easy, but as we learned, it's not—which makes playing with it so engaging. Instead of stacking, TrueChallenge is all about spinning. This handheld puzzle toy was originally invented by a rocket scientist and harnesses the attraction and repulsion of magnets. Twist and turn it to get all magnetic pieces to attract. It’s as challenging as it is captivating, and will keep kids (and some adults) busy trying to solve it.