Mario & Luigi: Brothership doesn't contain many boss fights, but every once in a while the game will throw a tough obstacle in the player's path. One of these is Gobblick, the guardian boss of the first Great Lighthouse Island. This island and boss unlock after the player completes all prior islands in the Lushgreen Sea.

I used to play Mario & Luigi RPGs on the Nintendo DS a long time ago. I always got a kick out of how they cleverly blended controls for both Mario and Luigi with button-mapping, making it feel like you were taking both on an adventure.