Manhole
From the Super Mario Wiki
This article is about the holes found in Super Mario Sunshine. For information about the Game & Watch game of the same name, see Manhole (Game & Watch).
Manholes are holes that are located in various places in Super Mario Sunshine. Most are found in the Delfino Plaza, but some appear in other levels, such as Ricco Harbor. Manholes lead to the intricate underground sewer system, and can lead Mario to places he cannot access aboveground, as well as to coins and other items. To access it, Mario must Ground Pound on a manhole. The manhole covers, which have a sun on them originally, when ground-pounded, will flip, revealing a moon. When underground, a remix of the underground theme from Super Mario Bros. will play. Manhole covers can also be seen in the Delfino Plaza stage in Super Smash Bros. Brawl but they serve no purpose. To get out of one, Jump.
