In an age where the bulk of practicing geeks can remember a childhood full of He-Man action figures and other static toys, it’s mind-blowing (figuratively) to witness the dawn of an age where a child’s toy can be mind-blowing (literally). A multiplayer extension of its 2009 offering, Mattel is gearing up to release a head-to-head version of its game Mindflex, dubbed Mindflex Duel. The object is to push a small ball along a path, through various obstacles – with nothing but your mind. Your opponent does the same, and the result is presumably a head-to-head tug-of-war (or push-of-war) to the finish….