As you race, the tracks literally fall apart. A road might crumble into the ocean, forcing your vehicle to transform into a boat mid-drift.
By crossing the finish line together, the racers create a "Speed Singularity." This blast of energy resets The Grid, restoring the worlds to their former glory. The heroes return to their own dimensions, but their vehicles keep their transforming tech—just in case the finish line moves again. Sonic & All-Stars Racing Transformed
Dr. Eggman has hacked The Grid. He isn’t just trying to win; he’s trying to rewrite the Sega universe in his own image, deleting anyone who finishes behind him. As you race, the tracks literally fall apart