Did you ever play Frogger and think, "this is great with a joystick, but what would really be awesome is if I could just use my face?" No. You did not. That would have felt like a stupid request unless you're a game developer exploring new modes of input. But don't worry, developer Nathan Gitter made it happen anyways. Rainbrow is a new game that lets you navigate a rainbow using nothing but your eyebrows.