The Deep Shell Well

The Deep Shell Well is the first mission of the Slimy Spring Galaxy in Super Mario Galaxy 2. The mission's objective is to navigate the waters to find the Toad Brigade Captain.

Layout
The player starts off in the Under Ground Dangeon Planet A. They should drop down the slide and into the water. The player can grab a Green Shell for faster transportation and to defeat Snoodles. While in the small tunnel, they can detour to the left into a narrow passage, get the Comet Medal and exit the area. The following area has the player swimming among more Snoodles until they get to an upward slope, where they must avoid the Urchins and Gringills at the top. They should continue swimming through the downwards slope until they reach the Launch Star that takes them to the next planet. The player must drop down the hole and grab a Green Shell at the bottom. The next section involves swimming through rings to get speed boosts while avoiding Boos and crashing into the walls. At the end of the tunnel, swimming up the slope will lead outside. Mario or Luigi must throw a shell at the treasure chest, freeing the Toad Brigade Captain who grants him the Power Star.