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

Code Input Screen
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
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
Enter ANGMNGT on the Code Input menu to unlock this cheat. This causes the rage meter to constantly remain full.