I like to keep a Perplexus maze puzzle close at hand to give my brain a break from work, or just to fiddle with. Don’t think for a moment this is a puzzle that you’ll solve once and never touch again. These things are absolutely addictive, and seem to play a little differently each time you pick it up. When friends and friends’ kids come over, the Perplexus is irresistible. Right now the motorized “perpetual motion” Perplexus Revolution Runner is only $10.97 at Walmart.