There is more than one code for each level. Each has different weapons and lives.
Level Password Alternate 1 Alternate 2
2 N1PBBDG8V QQPBBYGYV Q8QBBYQ6V
3 XG#BVMVFW GP4BVD6RW 439BBP6LW
4 85DCVLQVC 4GKCVDLZC
5 GNWCVBGMD 6PXCBCVBN
6 SP2CBBV8J N93CVBG8J