To get full fire power go to a level where you can find Rapid Fire. Grab one, then either go to a different level or restart the same level. You will start with full power for the entire level. When you finish the level or die you will lose your full power and have to repeat the trick.

Enter these codes while playing.

Code      Effect
FEELGOOD  Full power
BLAKE     All keys
BANANA    Fire power
QUARK     Super fire power

Type in BANANA to get 3 Super Fireballs