In season three of “House of Cards,” Underwood is revealed to be more than a casual gamer. After a long day of work, he lays belly-down on his couch and stares at his iPad and plays “Monument Valley,” the 2014 Apple iPad game of the year by ustwo. It’s a geometric puzzler of striking beauty. You lead a tiny princess through impossibly shifting castles, manipulating architecture and perspective to connect pathway and staircases. Each movement is a small epiphany as minarets pivot to create newly entangled routes.