Unlock All Levels
Go to the Password screen and enter the following code: *S3L3CT0N*, then press OK. Go right back to the Password screen from the main menu and enter this code: *SH0WT1M3*, then press OK. All levels are unlocked for your shooting pleasure.
View All Bosses
To view an end level boss, go to the Game Options screen and highlight Start Level. Select your level, then highlight the option for Start at Boss. Select Yes, then OK and you will be at the boss fight.
Gallery mode
Enter *G4LL3RY* as a password.
Infinite Lives and Best Weapons
Password: *1NV1S4BL3*
Level Passwords
Level - PW1 - PW2 - PW3
2 - N1PBBDG8V - QQPBBYGYV - Q8QBBYQ6V
3 - XG#BVMVFW - GP4BVD6RW - 439BBP6LW
4 - 85DCVLQVC - 4GKCVDLZC
5 - GNWCVBGMD - 6PXCBCVBN
6 - SP2CBBV8J - N93CVBG8J
Ending music
Enter *CR3D1TS* as a password.