The primary objective of Radial 50 is to survive 50 rounds of increasingly difficult gameplay and over those rounds achieve the highest score possible. To pass each round, you will use the iPhone's touch screen to control the paddle to project the ball towards the targets. Striking the targets will eventually unlock the center defense, allowing you to strike the inner most diamond and advance to the next round. If you miss the ball, allowing it to strike the outer playfield wall, you will lose paddle health. Letting the ball strike the wall too many times will eliminate all health. Health will regenerate over time, but once you lose all health the game is over.