For all the shooters and racing games that mobile fans see, there's another subset that seems specifically made for the touch environment. "Zen" games are popular because they're relatively simple, can be played in short bursts to cure boredom, and ultimately allow their audience to sit back and relax. Pixel Twist fulfills all three of those criteria.
Pixel Twist starts off quite simple: you're given an exploded view of an image, like a lime, painting or game controller, and by moving the camera around you can line up the pixels so that they form a complete picture.
As you can see from the left screenshot, the game provides a hint to particularly frazzled players on the first few levels, but eventually they disappear.