Diddy Kong Racing Adventure

Diddy Kong Racing Adventure is a rejected pitch made by the Climax Group for a Diddy Kong Racing sequel on the Nintendo GameCube around 2004. The project was never announced to the public in any capacity and only became known after an amateur video game archivist acquired the prototype and published a video about it in November 2016.

Plot
After his defeat in Diddy Kong Racing, Wizpig allied himself with the Kremlings to get his revenge. While Diddy Kong is away on a visit to Timber Island, the Kremlings have been kidnapping members of the Kong clan, Wizpig is in the process of converting Kongo Island into a gigantic raceway. Upon returning and seeing the Kremlings bulldoze the forest, Diddy Kong gathers the racers of the original Diddy Kong Racing to challenge Wizpig and stop his destruction of Kongo Island.

An earlier document had a similar plot, except for the role of Wizpig being instead filled by a new villain named "Wicked White Rhino Baron von Smorg".

Gameplay
Diddy Kong Racing Adventure would have an Adventure Mode like its predecessor. The pitch document promised any new features such as the ability to change vehicles mid-race, the ability to collect items to customize the vehicles and reach new areas, and special attack exclusice to each character.

To challenge the bosses, the player would either have to beat them in a preliminary heat or by collecting an item for the villain. The game would have featured non-racing events such as obstacle courses and stunt challenges.

Locations
The pitch document mentioned the game would feature 16 villages, each with three different courses. New locations planned for the game included:


 * Kong Familly village
 * Icy Peaks, featuring Candy Kong's ski chalet
 * Pirate Lagoon, featuring Funky Kong's surf resort.
 * The Rainforest
 * Kremling Construction Camp, featuring treetop walkways and an unfinished stadium
 * Krem Co. Industries
 * Krunch's den
 * Wizpig's Futuristic Raceway

Characters
Each characters would appeared in different weight classes and they have their own special moves, which they cost bananas. There would had been playable fourteen characters in the game. Other Donkey Kong characters like Dixie Kong and Lanky Kong along with others from the Kong Family were considered to be in the game as playable characters along with Banjo and Mumbo Jumbo from Banjo-Kazooie series from Rare.
 * Diddy Kong would have returned, he appears in the pitched demo riding on a Rhinoceros which its model came from another game.
 * Tiptup would have returned, he would have spinning rings of turtle shells as a special move.
 * Timber another character from the previous game would have returned, he would have a special move which he roars a unavoidable sonic wave that slows down racers.
 * Krunch another character also from the previous game would have returned, he would use his jaw to chase down other racers as a special move.
 * Dark versions of Diddy Kong, Pipsy, Bumper and along with others, would have appeared in the game.
 * Dark Pipsy would have a special move which she throws triangular cheese wedges that damage the player either slowing down or lose control.
 * Dark Bumper would have mud tornado as his special move.
 * Conker, a character from Rare would have returned with his explosive nuts as his special move.
 * Donkey Kong was going to be a playable character, unlocked after winning every race