Disguised as a mere toy, the original Mindflex is actually a kind of limited telekinesis simulator in that it allows you to control the up and down movements of a ball suspended in air by, well, flexing your brain. With the release of the Mindflex Duel, you can now test your telekinetic prowess against that of your closest friends. That's right, Mattel's latest offering allows you to play what amounts to tug-of-war (with a tiny foam ball) using only the power of your mind. The Duel also lets people play cooperatively, but that doesn't sound like nearly as much fun as hooking this to a stim unit for a little friendly competition and some elevated stakes for the loser. We're not sure why, but the mind games won't start until August, though the device is currently available for pre-order on Amazon for $99.99.