Go to the menu screen and enter a code below:

Code - Effect

gotonext - Skip Level
fire - Get Fire Ball
acid - Get Acid Ball
gun - Get Laser
magnet - Get Magnet
water - Get Water Ball
rocket - Rocket Launcher
flash - Thunder Bolt
ufo - Summon UFO
four - Four Ball
sunnycheats - Enable cheats
open all - Get all levels
two - Ball Doubler
addlife - Extra Life