Wario Land 3: Part 65: Beneath the Waves (Red Chest)

With the Frog Prince's Glove, Wario's swimming skills are upgraded, allowing him to swim fast through currents. He can use this to reach the first underwater doorway of the level. First, he swims southwest into an underwater area, then goes into the walls to reach a doorway containing the Red Key. After returning, he enters that doorway, then uses zipline pulleys in the next room to climb to the top-right doorway, leading to the Red Chest. The Red Chest contains a Red Crayon, which colors the door of the GAME building Wario passes by between the North and West sides of the world.