100 lives:
Enter HGDM as a password.

Type	Level 1	Level 2	Level 3	Level 4	Level 5
Eagle		HGKM	CPFG	JJCM	DKLF
Albatross		HGNC	BMHB	DGBF	JGJH
Ace		GBHL	MHCB	CDMN	KDPG
Ultimate	GDLP	LMCJ	LLHL	HFKP	BNGN

Other passwords:
Enter one of the following passwords to play in other levels of the game,

GBAL
IDCP
LEOJ
JJOE
ODEN
COHL
KDPI
AFKP

Hint: Fly through wall:
Fly at the bottom of level 5 until reaching a dead end. Move to the lower left corner of this area and hold Down/Left.