You run hand in hand with another runner, each one in the opposite direction around a planet, and wins the first that reaches the antipodes! Between races you can buy upgrades and repairs for your vehicle. You can select three general levels of difficulty (easy, medium, hard) and play in 5 different planets, but when you start you cannot play in all of them, because there's a cost to reach some. In each race you can earn money or new cars: it's a decision that you take before a race starts.
Arrow keys to move, space bar for extra speed. Interact with the mouse to buy stuff between races.