Cheat mode
     Collect  five  DK  coins  to  unlock  the  "Cheat"  option at the
"Extras"  menu, with an option that allows you to resume the game with
either five or twenty lives after getting a game over.

Secret Levels
     Once  you  have  the  required amount of oil barrels for a world,
press X to bring up Funky who will fly you to the secret level.

Little Chill 'n' Char Island: Collect all 5 oil barrels 
                              in Chill 'n' Char Island 
Little Ghost Island:          Collect all 5 oil barrels 
                              on Ghost Island 
Little High High Island:      Collect both oil barrels 
                              in Little High High Island 
Little Lost Island:           Collect all 5 oil barrels 
                              on Lost Island 
Little Sun Sun Island:        Collect all 4 oil barrels 
                              on Sun Sun Island 

Extra Stages
     After you beat the main story of DK Jungle Climber, you'll unlock
new extra stages depending on how many banana coins you've earned.

Extra Stages in Main Menu: Beat game to open.
Stage 1 in Extra: Collect 10 banana coins. 
Stage 10 in Extra: Collect 100 banana coins.
Stage 11 in Extra: Collect all 105 banana coins.
Stage 2 in Extra: Collect 20 banana coins.
Stage 3 in Extra: Collect 30 banana coins.
Stage 4 in Extra: Collect 40 banana coins.
Stage 5 in Extra: Collect 50 banana coins.
Stage 6 in Extra: Collect 60 banana coins.
Stage 7 in Extra: Collect 70 banana coins.
Stage 8 in Extra: Collect 80 banana coins.
Stage 9 in Extra: Collect 90 banana coins.