Krematoa

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.

Stampede Sprint
This is the third and final jungle area. Ellie takes the majority of this level along with Parry. Ellie will begin to run out of control after being scared off by three Sneeks and try to avoid dangerous obstacles or bash enemies until the end of the level.

Criss Cross Cliffs
This is the fourth cliffside level. The Kongs must climb to the top via shooting steel barrels from a Bazuka. The Kong also must switch barrels to eliminate red Buzzes with TNT Barrels that will block the Kongs' way.

Tyrant Twin Tussle
This is the fourth and final cave level. The level is infested with the deadly Kremling duo, Kuff 'n' Klout. They will do anything to hurt the Kongs by running or doing leap-frog. They are vulnerable to TNT barrels or Squitter's web attack.

Swoopy Salvo
This is the fourth and final tree level. The level is infested with Swoopies. This is their second appearance as one appeared in Springin' Spiders. The swoopys will make good platforms to climb to the top of the finish, but most will fly in a line as a force field to block the Kongs' way.

Rocket Rush
This is the fifth and final cliffside level. The Kongs will begin to go in a rocket barrel to glide down and gather fuel. The level's only enemies are red Buzzes that are vulnerable to the fire from the rocket. This is considered the most difficult level of all because after getting halfway done, the Kongs must keep going up in order not to run out of fuel and not to bump into rock formations.

Knautilus
This second duel with Baron K. Roolenstein takes place in a submarine. The name also derives from the submarine, Nautilus from 20,000 Leagues Under the Sea. The Kongs must toss steel barrels at Baron K. Roolenstein and avoid getting electrocuted from flying sparks at all costs.

Brothers Bear's House

 * Boomer's Bomb Shelter

Trivia

 * Krematoa is the only world in Donkey Kong Country 3 that doesn't have a Banana Bird Cave and Swanky's Sideshow.