Donkey Kong Country 2:
Diddy's Kong Quest

Sound Test:
Select the an empty game slot at the game
selection screen. Go down to "Two Player Contest"
then press D, D, D, D, D.
The Sound Test option will now appear.

Cheat Mode:
Select the an empty game slot at the game
selection screen. Go down to "Two Player Contest"
then press D, D, D, D, D.
The Sound Test option will now appear.
then press D, D, D, D, D.
The Cheat Mode option will now appear.

Fifty Lives:
Highlight the Cheat Mode Option and press.
Y, A, SL, A, D, L, A, D.

Harder Game:
Highlight the Cheat Mode Option and press.
B, A, R, R, A, L, A, X.
The DK Barrels will now not appear.