50 Lives 
     At the Select Game screen, highlight "Erase Game" and press B, A, R,
     R, A, L and then begin with one of your saved games. 

Bonus Stages 
     Turn on the game. When Grandpa appears and starts playing music,
     press Down, Y, Down, Down, Y. You can now select any bonus
     stage. 

Control Transfer 
     At the Select Game screen, highlight "Erase Game" and press B, A,
     Down, B, Up, Down, Down, Y. In two-player team games, this trick
     enables either player to gain control at any time by pressing Select. 

Extra Lives in Level 1 
     As soon as the game begins, climb up the rocks and enter the hut
     behind you. Inside you'll find a red balloon worth 1 life. Once you've
     finished this level you can return, grab the balloon, then press Start +
     Select to exit the level. Repeate the process until you have the desired
     number of lives (up to 99.) 

Extra Lives in Maniac Mincers 
     In Maniac Mincers find the Krusha stuck in a hole. Use Diddy to drop
     on top of him and keep bouncing at him for extra lives! 

Fly Around the Minecart Stage 
     Once you reach the first save point of the minecart stage, kill yourself.
     When you come out of the barrel, immediately hold Y + B before you
     fall into it. As long as you're holding these buttons you can fly around
     the stage, but you can't finish the level until you return to the save barrel
     and enter the mine cart. 

Infinite Lives 
     Start a game and beat the first level. Return to the first level and lose all
     your lives. When Kranky Kong reappears, press Down, Y, Down,
     Down, Y to enter a secret bonus area. Now hold START, and tap
     SELECT to return to the game with infinite lives. 

Level Warps 
     In World 1 go between the Lake level and Funky's Flight's press the
     button B until Donkey Kong stops in the middle, you will be warped to
     the Sunset level in World 3! You can also use this trick in between
     Koral Kapers and Funky's Flights in Kongo Jungle to skip ahead to
     Orang-Utan Gang in Vine Valley. 

Minecart Shortcut 
     At the beginning of the level, instead of going into the barrel jump over
     it and you will be transported to the end of the level. 

Secret Bonus Round 
     To make this trick work effectively, you must use saved games. On
     your last life, you must die playing as Diddy Kong. At the "Game
     Over" screen, press Start. When Cranky Kong appears on the
     screen, press Down, Y, Down, Down, Y. A room will appear with
     three gold Rambis, three gold Winkys, three gold Enguardes, and three
     gold Expressos. You may enter any of these four bonus rounds as
     often as you like, to collect as many 1-ups as you want. To leave the
     special bonus area, press Start to pause, then press Select. You
     return with all your new 1-ups to the area where you last died. 

Sound Test 
     At the Select Game screen, highlight "Erase Game" and press Down,
     A, R, B, Y, Down, A, Y. Press Select to skip through the game
     sounds and music. 

Stop and Go Station Shortcut 
     When you first enter the Stop & Go Station, jump towards the
     entrance. When you hit the wall, keep holding forward. You will enter
     a secret warp that takes you to the exit of the level.