Goomboss Battle

Goomboss Battle is a level featured only in Super Mario 64 DS.

This location is where Yoshi goes and tries to save Mario from his capture. This level has many pools of poisonous liquid that can end up dealing heavy damage. At the top of the giant stump, is an entrance to the local where Goomboss awaits.

Upon reaching this area, Yoshi and Goomboss enter a deadly battle and after defeating him, Yoshi saves Mario. This allows "the player" to use Mario throughout the game.