Super Mario Kart XTREME : Help Mario to race his kart as fast as possible to run over all the enemies. Select your racer from Mario or Luigi and start racing. Avoid all the obstacles like rocks, etc and run over as many enemies as possible to score points. Do not go very slow else the stronger enemies will block your way and damage the car. Use the up arrow to go up, down arrow to go down, left arrow to turn left, right arrow to turn right, and press A key for nitro boost. The game will be over if your kart breaks down.