Gusher Gauntlet is the fourth mission in Splatoon's single-player mode, Octo Valley. It is the first mission of Area 2, coming directly after the first boss, The Mighty Octostomp!. It is also the first mission to include Octostamps, and is named for the many gushers throughout the mission.
As the name suggests, Gusher Gauntlet features many Gushers to use for navigation, offensive tactics, and defensive tactics. The first areas use Gushers for platforming challenges, before turning to defensive tools in the third and fourth areas. The final area uses Gushers to ambush enemies while climbing a tall tower to get to the Zapfish.
Collectibles
Sunken Scroll
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This scroll was found in a deep rock layer, its age estimated at approximately 2,000 years. It details the ancient Turf Wars of the time. It seems the ancient four-versus-four battle format had already been established at this stage.
Use the first Gusher you encounter and ride to its surface. Then, take the left Gusher to its top, and take the next left Gusher you see also to its top. Defeat the Twintacle Octotrooper and the crate immediately underneath it to reveal Sunken Scroll 4.