Mega Goomba (boss)

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

Before the battle, a seemingly regular Goomba walks on-screen before transforming into Mega Goomba and commencing the battle. 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. It is possible to defeat Mega Goomba without using the ? Switch. To do this Mario or Luigi must perform Wall Jumps. If Mario is in his Fire form, he can also defeat Mega Goomba if he stays on the far left area and shoots enough fireballs to defeat him; when Mega Goomba approaches Mario on the far left side, he does not hurt Mario due to its mushroom-sized hitbox.

Once Mario Ground Pounds Mega Goomba three times (or nine times if Mario is in his Mini form), the Goomba will be defeated, and Mario can get the key to World 5.

Trivia

 * In the very first footage of New Super Mario Bros., the (or a) Mega Goomba was a normal Goomba until it came into contact with a mushroom.