40 Banana Coins 
       On the Game Selection screen, hold RIGHT or LEFT in front of the
       game you wish to play on, then press B, B, A, A. You should hear
       a chime if you did this right. 

All Kremcoins 
       On the Game Selection screen, hold RIGHT or LEFT in front of the
       game you wish to play on, then press A, B, A, B. You should hear
       a chime if you did this right. 

Exit completed levels 
       In completed levels you can pause and then press start + select
       to exit a level. 

Extra Lives 
       On the Game Selection screen, hold RIGHT or LEFT in front of 
       the game you wish to play on, then press A, A, B, B. You should
       hear a chime if you did this right. 

Harder Levels 
       After you collect all 40 DK coins. go to the second Captain K. 
       Rool in the Lost World and beat him. When you beat him there
       should be a screen that shows Mario, Yoshi, and Diddy. 

The Lost World 
       If you collect all 47 Klemcoins you can visit the Lost World. 
       When you have all of the coins, go to the guy with the humongus 
       club. Give him the coins, and he will let you into the Lost 
       World. If you beat Captain K. Rool again you will
       see the real ending.