Game Description:When a friendly competition between Sonic and Knuckles attracts the attention of all of Sonic's rivals, things heat up to blistering speeds! Use boost moves and power-ups to hurtle towards the finish line, as your opponent tries to trip you up with various moves. Avoid traps and hazards as you negotiate the twisting 3D tracks. Play single player or head-to-head with a friend. You'll be racing in classic 2D gameplay, but the 3D environments are custom-built for the PSP to enhance the thrill of the race. Choose from one of four different characters, each with their own story. Enhance your character's abilities by trading and collecting cards.