Circuit Break Island is a location only mentioned in the game Paper Mario: The Thousand-Year Door.
Circuit Break Island is an island that Luigi visited during his journey for the Marvelous Compass. On Circuit Break Island, Luigi states that the people there have kart races every day. One of the races involved a piece of the Marvelous Compass being the grand prize and even become king or queen of the island for one day. Luigi enters on the Big Green 01 but the vehicle drove in reverse causing Luigi to collide with the other racers. However, Luigi still ends up winning due to having the only kart that is still left intact and wins the Marvelous Compass piece and become king for a day. However, he turned down the offer as he must continue his journey to collect the other pieces and rescue Princess Eclair.