A Goomba button is a numbered button in the shape of a Goomba appearing in Super Mario Odyssey. It can be pressed only by standing on it as a captured Goomba Tower consisting of at least the number of Goombas indicated by the number printed on it. After the player activates a Goomba button, a Power Moon appears.
Three Goomba buttons are found in the game: two in the Snow Kingdom, and one in Bowser's Kingdom. In the Snow Kingdom, the first Goomba button is located in the Icicle Cavern and requires four Goombas to be activated to reveal the Power Moon for the sidequest Ice-Dodging Goomba Stack. After the player climbs higher in the cavern, the second Goomba button can be found, which requires ten Goombas and reveals the Power Moon for the sidequest Stacked-Up Ice Climb. This Goomba button appears only after the player breaks the kingdom's Moon Rock. In Bowser's Kingdom, another Goomba button that requires ten Goombas is located behind the right wall past the starting gate, and it reveals the Power Moon for the sidequest Stack Up Above the Wall.
- Super Mario Odyssey Prima guide, page 157