In beautifully animated 3D worlds; roll your ChromaSphere to the end of the level. At the intro you get a panning sweep of the level that shows you the route and from a fixed perspective, tilt your device to roll the ball in a particular direction. You can shift this fixed perspective and a tap of the screen shows you your rear-view.
Unfortunately, a lot of the commendable graphics are wasted; as your device is tilted away from you to accelerate forwards, meaning you can't actually see the screen for a lot of the game. The difficulty level is savage; some of the 'cleanest' runs only get you a Bronze. There are colour-based acceleration points, depending on what colour ('Chroma') your sphere is in at any given moment. It's entertaining, well animated, but somehow not that fun.