Hooplagoon, Relic of the Ruins is the eighth stage in Kirby and the Rainbow Curse. It is the fourth stage of Yellow Dunes and the second boss stage of the game. It succeeds The Long-Lost Ruins and precedes Swept Out to Sea.
Kirby begins this stage by digging downward through clay in ancient ruins. The boss, Hooplagoon, attacks by firing laser beams as he bounces around the arena and surrounding himself with electric barriers. Kirby can attack his four armor plates with Tap Dashes and Star Dashes; the former is ineffective against his metal plate. Hooplagoon get angrier and grows larger as he takes damage.