Code Input Screen Cheats 
     Enter these cheats at the code input screen in the Options menu:

Double Health for Enemies         BRNGITN 
Double Health for Hulk            HLTHDSE 
Half Enemies' HP                  MMMYHLP 
High Score reset                  NMBTHIH 
Invincibility                     GMMSKIN 
Level Select                      TRUBLVR
Regenerator                       FLSHWND
Unlimited Continues               GRNCHTR 
 
Code Terminal Cheats 
     Enter these cheats at a code terminal in the game:

Play as Gray Hulk                 JANITOR 
Unlock Desert Battle art          FIFTEEN 
Unlock Hulk Movie FMV art         NANOMED 
Unlock Hulk Transformed art       SANFRAN 
Unlock Hulk vs. Hulk Dogs art     PITBULL 
 
 
Full Rage Meter Cheat 
     Enter ANGMNGT on the "Code Input" menu to unlock this cheat. This
causes the the Rage meter to constantly remain full.

Puzzles Solved Cheat 
     Enter  BRCESTN  on the Code Input menu to unlock this cheat. This
causes puzzles to be automatically solved.

Wicked Punch Cheat 
     Enter  FSTOFRY  on the Code Input menu to unlock this cheat. This
lets Hulk kill bad guys with one hit.

Hint: Half-Life Halved 
     To kill Half-Life faster, knock him into the generators.