The M Car is a type of a Koopa Clown Car that Mario, Luigi, Blue Toad, and Yellow Toad gets to use. This item is only in one level, and it is what is used to fight Bowser Jr. in the second battle. The M Car highly resembles a usual Clown Car except that it either has an M, L, or a Mushroom (for the Toads) on it instead of a face.