Gravity Assist is a light racing game where you play as a ship in outer space trying to get through a series of planets/asteroids. The game allows you to challenge your personal time through single-player mode or compete against your friends in multiplayer mode. The goal of the game is to get through the order of planets/asteroids in the quickest time.
2-player mode
Link: http://www.personal.psu.edu/btd5030/gravityassist/