Challenge 360 is an arcade game that will remind you of geometry. In each level, your task is to reach a specified range of degrees by pointing your finger at a circle. Simply hold your finger on the screen and it will begin to fill up, then release it when you think you've reached the right spot. I hope you remember that a circle is 360 degrees. The game has 100 levels, and each level the range shrinks further and further. But if you succeed, you'll never need a protractor again.