Kastle Kaos

"So, who owns the castle?"

- Dixie Kong

Kastle Kaos is a large, looming castle and the boss level of Kaos Kore in Donkey Kong Country 3: Dixie Kong's Double Trouble! It is the main base-of-operations of KAOS and Baron K. Roolenstein, and is where Dixie and Kiddy Kong fight both of them. Kastle Kaos features many towers, the highest of which emits a mysterious pink glow, and overlooks the lake and waterfalls of Kaos Kore. The castle itself is built out of light brown-colored bricks. The exterior is mostly shown from official artwork, because it is only shown as a faint, birds-eye-view from the Kaos Kore map. In the Game Boy Advance port, the whole exterior was redesigned to be held together by green pillars with yellow spikes protruding across the castle.

Overview
The Kongs fight KAOS and Baron K. Roolenstein within a large room of the castle, which is the only part of the interior shown. The room appears to be a small laboratory (possibly based on ), featuring some control panels in front of a large window, a beaker, three shelves of books on the right wall, and chains that hang from the ceiling. There is also a red curtain on the right wall concealing a chamber. There are two large bulbs on each side of the room which at first serve at platforms, but are used to generate electricity later. There will be a DK Barrel at the start if the player enters the stage with only one Kong.

Upon entering the castle, the Kongs are confronted by KAOS. Much like in his first battle, he attempts to burn the Kongs with his exhaust flames. They must throw a barrel at his head to damage him. This causes the head to fly off, revealing another head. KAOS moves to the center of the arena and starts launching bombs in an arc. A barrel appears on the other side and the Kongs must once again throw it at KAOS's head. After firing four bombs, KAOS ceases to function, and a hook comes down to lift him offscreen. In a reference to , the curtain rises up, revealing a control panel from which Baron K. Roolenstein was operating KAOS. If any Kongs were lost while fighting KAOS, a DK Barrel will appear so the player will have both Kongs going into the fight with K. Rool.

K. Rool starts the battle off by using his remote to make two levers to descend from the ceiling. He then starts hovering to the left and right. The Kongs can duck under him to avoid being hit. They must grab onto the levers to make barrels drop from the ceiling, then throw them at K. Rool's Propellerpack to damage him. Each time he is hit, he will bounce around for a few seconds. After two hits, K. Rool uses his remote to change the layout of the stage. There are now three levers on the ceiling and a wooden platform above the bulb on the right. The bulbs start generating electricity, which covers the entire floor, making it no longer safe to traverse. The Kongs must leap across the levers while avoiding K. Rool. Pulling the lever on the far left spawns more barrels to hit K. Rool's Propellerpack with. Each hit causes K. Rool to fall into the flowing electricity, shocking him. After the fourth hit, K. Rool changes the layout again. The wooden platform moves to the left side and another one spawns to the right of it. This second platform continuously moves left and right. The Kongs must ride the platform to reach the lever on the right and supply themselves with more barrels.

K. Rool changes the layout again after two more hits. The wooden platforms now remain stationary above the two bulbs, which now generate electricity in brief bursts roughly every three seconds rather than continuously. There are two levers that spawn barrels, and the Kongs must alternate pulling each lever to keep spawning more of them. The electricity destroys the barrels, so the Kongs must quickly grab them after the drop from the ceiling. After taking a total of nine hits, K. Rool falls through the floor and drops a Bonus Coin. KAOS's body drops down from the ceiling, and Donkey Kong and Diddy Kong fall out of it, revealing that they were being used as a power source for KAOS. Cranky then appears, saying he wasn't impressed by the Kongs' victory, which angers them.

If the Kongs return to this stage after completing it and beat Baron K. Roolenstein again, they are rewarded with a bear coin instead of a Bonus Coin. If the Kongs defeat KAOS but lose to K. Rool, they do not fight KAOS again when re-entering the stage. KAOS only needs to be rematched if the player gets a Game Over or resets the game. In the Game Boy Advance version, KAOS cannot be rematched at all; the level will always start with the fight against K. Rool if KAOS has already been defeated.