In the game he will first be seen as a regular Goomba who somehow turns into a giant Goomba. He would try to ram into Mario. Mario can avoid Mega Goomba's attacks by crouching into a small gap or jumping onto a ! Switch to make two rising platforms appear so Mario can rise up and ground-pound on Mega Goomba three times before it passes out. After defeating Mega Goomba, Mario will gain the key to World 5.