There are two versions of this game. If the "A" codes don't work 
on the game, try the "B" codes.

Version A Codes:

C95-9CE-C49 Infinite energy on scrolling levels
AF4-D9A-3B7 Infinite energy on ED-209 (tm) levels
02A-E8E-F7A Start with 2 lives
05A-E8E-F7A Start with 5 lives
B60-C2D-3BE Infinite lives
C95-48E-C49 Infinite time--except stages 3 and 8

Version B Codes:

010-17B-2AA Start with 1 energy
060-17B-2AA Start with 6 energy
090-17B-2AA Start with 9 energy
FA9-CAE-4C1 Infinite energy
00C-50D-3BE Infinite time
011-D8E-6EA Start with 1 shotgun shot
061-D8E-6EA Start with 6 shotgun shots
091-D8E-6EA Start with 9 shotgun shots
FAB-4DE-4C1 Infinite shots
005-15F-A22 No men in windows