Donkey Kong Country 2 - Diddy's Kong Quest [Model SNS-ADNE-USA]

Cheat mode
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When you get to the game select screen highlight two player contest and press down 5 times to get to music test and another 5 times to get to cheat mode. Once in cheat mode, press these buttons to activate the cheats:
50 Lives: Y, A, Select, A, Down, Left, A, Down. Hard Mode (No Barrels): B, A, Right, Right, A, Left, A, X.

Extra ending
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Defeat K.K.Rool in the secret lost world boss to see an extra ending. Additionally, collect all 40 DK coins for an alterate extra ending.

Lost World
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To unlock the Lost World, you must pass the first world. In the all the other worlds, you will start to find a 'Klubba's Koisk' in each world. When you visit one, a Kremling named Klubba will ask you to give him 15 Kremcoins to enter The Lost World. If you do give 15 Kremcoins to Klubba in a particular world, you will unlock one particular level of the Lost World.
Animal Antics Level = Give Klubba 15 Kremcoins in K. Rool Keep
Black Ice Battle Level = Give Klubba 15 Kremcoins in Krem Quay
Fiery Furnace Level = Give Klubba 15 Kremcoins in Gloomy Gulch
Jungle Jinx Level = Give Klubba 15 Kremcoins in Crocodile Cauldron
Klobber Karnage Level = Give Klubba 15 Kremcoins in Krazy Kremland
Krocodile Kore Boss = Beat the game and all 5 Lost World levels.