Resolution Interactive's futuristic flying checkpoint racer Clusterball Arcade [App Store] has been reduced to $6.99 (down from $9.99) in the iTunes App Store for a "limited time."
Clusterball Arcade is an extension of an existing PC game called Clusterball which appears to be a multi-player sport. The iPhone version, however, is a one-man game against the clock and the scoreboard.
You are the pilot of a ship which you must glide over ramps, collect balls and score goals while attempting to complete the course within the allotted time. Despite the sports theme, the iPhone version of the game is more of a checkpoint racer with various obstacles and bonuses available along the way.
We reviewed the game a few weeks back and noted some serious memory usage issues. The developer has since worked to address these in the current 1.0.1 release.