Cheats:
On the first title screen, type "SCAMAGIC". In the game, press P for an extra life!

In pause mode, type "KLABAUTERMANN" to get up to 9 lives.

Passwords:
World 2: 52011413
World 3: 31245300
World 4: 15204524

Freezer:
012F13 = Lives
012F0F = Energy