Bowser in the Dark World

Bowser in the Dark World is the first Bowser level in Mario 64. It is accessed on the first floor of the castle, and contains the first boss fight with Bowser.

Big Goomba
In certain personalized copies, it is reported that a platform can be found with a large Goomba, similar to those found in Tiny-Huge Island. It usually takes 3 hits to defeat, and can drop either a star or red coin upon defeat.