Spiral Rider is a free game available on iPhone developed by VOODOO. The game involves creating huge spirals by removing bark from trunks and using them to collect coins and destroy obstacles in your way. The game is easy to understand and play, with simple controls that allow you to create your spirals with ease.

The game is extremely satisfying, with the sound effects and visuals immersing you in the game's world. The more spirals you create, the more coins you can collect, and the more obstacles you can destroy. The game's graphics are simple, but they are colorful and engaging, making it hard to put down.

Overall, Spiral Rider is a fun and addictive game that is perfect for passing the time. With its simple controls and satisfying gameplay, it is easy to see why so many people enjoy playing this game.