The whole game is just tilting the iPhone to pass through the gaps in ugly polygons. Despite what some reviews are saying, the frame rate is not smooth at all. Theres noticeable jerkiness every time you pass through a shape. Minor quibble, since the lack of any depth to the gameplays means that after a minute or two, youve seen everything the game has to offer, and theres little reason to persist with it, unless youve got OCD and cant help yourself.
simonsez40 about Putki