Level skip:
Enter H2F2 as a password. Press Start during game play to jump to the end of the level.

Unlimited lives:
Enter B32R as a password.

Level 4 on easy mode:
Enter 21LN as a password. Note: Level 4 is not normally playable under the easy difficulty setting.

Level 5 with extra lives and weapons:
Enter F5F5 as a password.

Level	Password
2	3KNT
3	MDWH
4	2S3W
5	1Z5C