Krematoa is a secret hidden world found in Donkey Kong Country 3: Dixie Kong's Double Trouble. It is a sunken volcano that is found by using the Turbo Ski to circle the four rocks lying around near Mekanos. The bear Boomer lives here, and he is necessary to access each level. However, he only accepts Bonus Coins, so that is what the Kongs must pay him to proceed. At the end of each level, the Kongs will find a Cog. When Boomer receives all five Cogs, K. Rool's Knautilus will rise from the sea, and he will be fought. The name Krematoa derives from a volcano called Krakatoa.