Before the iPhone revolutionized mobile gaming, the big trend was “one-button” cellphone games that were timing based and often extremely simple. Digital Chocolate figured out how to make the most of this formula with titles like Crazy Penguin Catapult and Kamikaze Robots, which were ported onto the iPhone but retained their simple control schemes. Now Glu is making a try at it, shifting away from tilt control and back to one-button gameplay with Jump O’Clock.

In Jump O’Clock, you control a tiny robot named Leo whose goal is to scale the inside of a giant clock. You can jump off the walls and latch onto spinning gears, letting go at just the right moment to climb a few feet higher. Eventually you’ll run into broken sections of the wall that burn you, bursts of hot steam that will make you lose your grip, and spikes and electrified gears that can trip you up and make you fall.