Scaler

Full health:
Pause game play, then select the "Audio" option at the menu. Then, press R, L, R, L, X(2), B(2), R, B. A message will confirm correct code entry.

200,000 Klokkies:
Pause game play, then select the "Audio" option at the menu. Then, press L(2), R(2), X, B, X. A message will confirm correct code entry.
Glovetummy.

Unlimited Electric Bombs:
Pause game play, then select the "Audio" option at the menu. Then, press R(2), L(2), X(2), B. A message will confirm correct code entry.
Glovetummy.

Hard mode:
Successfully complete the game under the normal difficulty setting with all 100 crystals on each level collected. Then, hold L + R and press Z at the title screen.

Alternate ending:
Collect all 100 Orbs and complete the game.

Faster credits:
Hold R while viewing the credits.

Hint: Fill Electric Bombs faster:
Hold B while you are on the vines.

Hint:Make Leon flinch:
You can make Leon flinch on any level where you have the option to talk to him. Tounge lick him or scratch him to make him flinch.
Will.