Goomba Mask

A Goomba Mask is an item that first appears Super Mario 3D World. It disguises the playable character as a Goomba, allowing them to walk past enemies without getting noticed and attacked.

Super Mario 3D World
In Super Mario 3D World, the mask can be found after defeating certain Goombas, or in the right statue near a set of Chargin' Chucks in World 5-1. Like several objects in the game, the Goomba Mask is worn over the player's body. Upon wearing it, Goombas, Galoombas and Mini Goombas do not recognize the player and will not attack, but other enemies like Koopa Troopas and Chargin' Chucks will still actively chase the player. Also, Spotlights do not react if the player is within sight. However, contact with enemies still causes damage, removing the mask. When the player jumps, the same sound effect plays as when a Goomba jumps. When the player crouch-walks while wearing the mask, the Goombas' walking sound is used. Power-ups cannot be used in this state, although Peach's float can still be used.

Super Mario Maker 2
In Super Mario Maker 2, knocking on a Warp Door in the Super Mario 3D World style may cause Weird Mario to appear while wearing a Goomba Mask. It was later added as a wearable object exclusive to the Super Mario 3D World style in the version 3.0.0 update released on April 22, 2020, allowing the player to avoid getting noticed by most enemies, unlike in Super Mario 3D World.

Paper Mario: The Origami King
In Paper Mario: The Origami King, a different Goomba Mask resembling a Paper Macho Goomba appears in the Shogun Studios storage area. If Mario wears it, he spins around and causes the mask's eyes to roll, with the funny appearance making Olivia laugh. Later, in Breezy Tunnel, Mario has to use the mask to cheer Olivia up after Bobby's death.