Circuit Break Island is an island where residents have kart races almost everyday. The winner becomes king or queen for the island for 24 hours. It is never seen and is only mentioned in Paper Mario: The Thousand-Year Door. Torque, a go-kart mechanic, lives there as well.
In Paper Mario: The Thousand-Year Door[]
Luigi visits the island to retrieve the 3rd part of the Marvelous Compass. He enters the race and claims that he and Torque won the race and received the part. In reality, he drove in reverse at the beginning of the race and destroyed the karts, making him the winner of the race. As a result, he won the part, while Torque, who never entered the race, followed Luigi so he would pay him for the damage he caused.