Mega Goomba (boss)

Mega Goomba is the boss of World 4 in New Super Mario Bros.

Before the battle, a seemingly regular Goomba transforms into Mega Goomba. When it grows, it makes a sound similar to touching a Mega Mushroom, only somewhat more menacing. Mario must defeat this boss to acquire the key that provides access to World 5.

To defeat Mega Goomba, Mario can activate a switch, causing two platforms to appear. When Mario stands on the platform, it will elevate in the air. From there, Mario can either Wall Jump, Jump, or Ground Pound directly on top of Mega Goomba. For the attack to be successful, Mario must Ground Pound the Goomba (unless he is Mega Mario or Shell Mario). Mario can also go off to the side, simply wall jump, then ground pound on Mega Goomba.

Once Mario hits Mega Goomba three times, the Goomba will be defeated, and Mario can get the key to World 5.

Trivia

 * In the very first previews of New Super Mario Bros., it was a normal level enemy Goomba until it was caught in contact with a Mega Mushroom which made it the same size as it was in the current game.
 * Mega Goomba is the only boss in New Super Mario Bros. (other than Petey Piranha) that can be defeated using one jump with a power-up other than the Mega Mushroom. In order to do this, Shell Mario needs to go to a wall and then wait for Mega Goomba to stop there. Once Mega Goomba hits the wall, Shell Mario needs to jump while in the crouching position. Normally, when Shell Mario hits Mega Goomba, Shell Mario will go in the opposite direction. Since hitting the wall lets Shell Mario to go towards the other wall when he hits Mega Goomba the first time, Shell Mario will hit Mega Goomba two more times due to the fact that Mega Goomba has a few invincibility frames.
 * It's possible to defeat Mega Goomba without using the ? Switch. To do this Mario or Luigi must perform Wall Jumps.