From the Super Mario Wiki
Secret Seclusion is the seventh and final world of Donkey Kong Country: Tropical Freeze. It is a hidden world located in the sky, and is unlocked when the player completes the game, by collecting all seven Mysterious Relics and defeating Lord Fredrik. Secret Seclusion is the shortest world in the game, with only three levels and no world boss.
The overworld consists of three small floating isles representing the three levels, around a larger island with a monkey statue holding the two halves of the completed relic. The levels themselves are set in an ancient pantheon above the clouds, decorated with golden fish statues and filled with treasure, similar to the bonus areas in the game. After the Kongs complete the first level, Levitation Station, the statue turns around to face the camera as the final two levels, Rocket Rails and Crazy Clouds, are unlocked.
After the player clears all three levels of Secret Seclusion, the monkey statue connects the two halves of the relic, and the player unlocks Hard Mode.
The music that plays throughout each level is an arrangement of the title theme from Donkey Kong Jr.
Each level has an image that can be unlocked by collecting all Puzzle Pieces in certain levels.
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