Donkey Kong Country cheats and cheat codes for Nintendo Wii

Start with 50 Bonus Lives:
When you are at the main menu, Highlight the "Erase Game" option,
then press B, A, R, R, A, L. Note: You can do this only with the 
Classic Controller.

Unlimited Bananas:
Get the frog in Bouncy Bonanza, then you will continuously be brought 
down a small path. Jump to get 3 bananas. Then, go back into the cave 
where you got the frog, and you will fall down again. You will find 
the same 3 bananas here. You can repeat this as many times you want.

Blast through mine cart carnage:
Near the begining jump over the cannon and fall next to the wall underneath. 
You should get blasted out of a cannon and sent in a cart almost all the 
way to the end of the level.