If you were eagerly awaiting the day you'd get to control a smartphone game with your eyebrows, the time is now. At least, if you own Apple's thousand-dollar iPhone X. "Rainbrow" (see what they did there) is the brainchild of Washington University computer science grad Nathan Gitter. The game harnesses the flagship's TrueDepth camera and ARKit augmented reality platform to deliver a headache-inducing arcade trip. Think Frogger, but instead of a frog dodging freeway traffic, you control a smiley across what looks like a Pride flag, dodging other emoji in order to amass points.