Hooplagoon of the Lake is the twentieth stage in Kirby and the Rainbow Curse. It is the fourth stage of Orange Woodland and the fifth boss stage of the game. It succeeds Deep-Divin' Kirby Submarine and precedes Burning Secrets.
Kirby dives into a lake and steers through currents and Gordos before reaching the boss. Hooplagoon now wears a diving mask and sports a magenta and orange color scheme. He uses the same attacks as in Hooplagoon, Relic of the Ruins: firing laser beams and generating electric barriers. The battle takes place underwater, making it more difficult for Kirby to maneuver. Like in the first battle, the hero can attack his four armor plates with Tap Dashes and Star Dashes; the former is ineffective against his metal plate.