Crouch

The crouch or duck move has been used in almost every Mario platformer made. Only Mario, Luigi, Wario, and Yoshi can use it so far. To use it simply press down or Z. If you release down or Z you will go back to standing position. It is used to duck under projectiles and slide under walls while in motion. They can chain it to a Somersault. Super Mario Sunshine is an exception because Mario can use a Somersault, which is a Crouch related move but he can't Crouch himself. If Mario or Luigi use it at the same time as a Jump in sidescrollers, they will still Crouch but be in the air. This is an advanced usage of it, and it can be utilized to get in small holes. It can also be used when under a thin hole to move an inch with each Jump. If you are under a thin hole and release the down button, the character performing it will go toward the opposite direction he is facing.