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List of extras in Donkey Kong Country: Tropical Freeze - COMPLETED PROJECT List of extras in Donkey Kong Country Returns - IN PROGRESS...

Donkey Kong Country Returns rewards players with a series of extra content once they complete certain tasks throughout the game, such as collecting all Puzzle Pieces, defeating a world's boss, or completing the game on Mirror Mode. The optional content can be accessed in the "EXTRAS" section of a game file, which contains galleries with images, music, dioramas and (only in the Nintendo 3DS version) cinematic video clips.

Diorama gallery
Dioramas are inanimate three-dimensional models logging various scenes from Donkey and Diddy Kong's journey on Donkey Kong Island, starting with the Jungle and ending with the Volcano. Each diorama is based on one of the eight main worlds; the conditions to unlock it are defeating the boss and collecting all Puzzle Pieces from the Key Temple level of that world for the first time. Unlocked dioramas can be viewed in their appointed gallery, and can be rotated and zoomed in or out.

Image gallery
The image gallery is divided into eight sub-galleries, each related to one subject, such as Tikis, bosses, or the various worlds of the game. Released during the development of the game, these artworks show various ideas that were accepted or discarded for the final product. A large part of the gallery can be gradually updated by collecting Puzzle Pieces, but some artworks require, for example, defeating the final boss or beating the game on Mirror Mode. The sub-galleries are as follows:
 * Critters 1 and Critters 2 Gallery – both galleries contain artworks presenting the many species that inhabit Donkey Kong Island, most of them malevolent;
 * Tiki Gallery – contains artworks related to the Tiki Tak Tribe;
 * Boss Gallery – contains artworks related to the eight bosses of the game;
 * Worlds Gallery – comprises landscapes and paysages on the island, or up-close scenes of the Kongs exploring certain parts of it;
 * Kong Gallery – contains artworks focused on the Kongs, their partners and their travels;
 * Golden Temple – contains numerous early ideas for the last level of the game, the Golden Temple;
 * Bonus Gallery – contains miscellaneous artworks.

The table below details the contents of these galleries with images (and their titles), descriptions, and the condition to unlock each of them.

Music gallery
Part of the game's complete soundtrack is available to listen to from the music gallery, which contains eight music sets corresponded to one of the eight main worlds of the game. A set can be unlocked by defeating the boss of its corresponding world.

Movie gallery
The movie gallery allows the player to rewatch the game's cutscenes and is exclusive to Donkey Kong Country Returns 3D. Movies can be unlocked by collecting Puzzle Pieces in the first eight levels of the Cloud world, which is also exclusive to the Nintendo 3DS version.

=List of Donkey Kong Country: Tropical Freeze pre-release and unused content=

Lost Mangroves
A steamboat model was built to serve as the basis for all mechanical structures present in Lost Mangroves. The steamboat itself is not fully used in the game, but a few instances appear in Trunk Twister.

Sea Breeze Cove
Despite being set in an aquatic world, only a few artworks show the Kongs swimming in water, the rest showing them walking on the shoreline or beside aquarium-like environments. This was probably in anticipation that the game would lack swimming mechanics, like Donkey Kong Country Returns, the predecessor, did.

Juicy Jungle
In most artworks related to Juicy Jungle, many pig characters looking similar to Professor Chops appear to populate the area and work inside the factory. Even though the factory setting of Juicy Jungle was kept, no pigs are seen, and the factory itself is fully automated in the final version.