The Hulk

Invulnerability:
Select the "Code Input" selection at the options screen, then enter GMMSKIN as a code to unlock this option at the cheats menu. The Hulk and Bruce Banner will be invincible.

Regenerator:
Select the "Code Input" selection at the options screen, then enter FLSHWND as a code to unlock this option at the cheats menu. The Hulk will regenerate faster.

Full Rage Meter:
Select the "Code Input" selection at the options screen, then enter ANGMNGT as a code to unlock this option at the cheats menu. The Rage meter always remains full.

Unlimited Continues:
Select the "Code Input" selection at the options screen, then enter GRNCHTR as a code to unlock this option at the cheats menu.

Double Hulk's HP:
Select the "Code Input" selection at the options screen, then enter HLTHDSE as a code to unlock this option at the cheats menu.

Double All Enemies HP:
Select the "Code Input" selection at the options screen, then enter BRNGITN as a code to unlock this option at the cheats menu.

Half All Enemies HP:
Select the "Code Input" selection at the options screen, then enter MMMYHLP as a code to unlock this option at the cheats menu.

Wicked Punch:
Select the "Code Input" selection at the options screen, then enter FSTOFRY as a code to unlock this option at the cheats menu. The Hulk will have one hit kills.

Puzzle Solved:
Select the "Code Input" selection at the options screen, then enter BRCESTN as a code to unlock this option at the cheats menu. Puzzles will immediately be solved.

Reset High Score:
Select the "Code Input" selection at the options screen, then enter NMBTHIH as a code to unlock this option at the cheats menu.

Unlock All Levels:
Select the "Code Input" selection at the options screen, then enter TRUBLVR as a code to unlock this option at the cheats menu.

Note: This will also unlock all of the challenge modes.
CANONPOWER.

Hulk Transformed movie art:
Find a terminal during game play, then enter SANFRAN as a code.

Hulk vs. Hulk Dogs movie art:
Find a terminal during game play, then enter PITBULL as a code.

Desert Battle movie art:
Find a terminal during game play, then enter FIFTEEN as a code.

Hulk Movie F/X movie art:
Find a terminal during game play, then enter NANOMED as a code.

Play as Gray Hulk:
Find a terminal during game play, then enter JANITOR as a code.

Hint: Betrayal: Falling soldier:
Grab a soldier and jump off the building where green arrows are pointing. As you land on another building, the man will disappear from your hands and you will hear him screaming.

Hint: Chemical Effects: Terminal:
When the level starts, go all the way down the hallway to Bruce Banners left. You will find a large door. Go through that door and either sneak past or defeat the guards. There should be a door to the left of you. Go through that door. Once through it, either defeat or sneak past the guards. Next, stand in the large circle with bars around it. Press Y at the screen inside of the circle with bars around it. This should take you to the fifth floor. Once there, you should see a large computer down the stairs. Either defeat or sneak past those guards. Go to the right of that big computer. You should find a smaller gray computer. Go to it and press Y. A code terminal screen should appear. Enter the desired terminal code. Note: Per game, you can only open up the code terminal once. Use it wisely unless you want to repeat the entire process.
CANONPOWER.

Hint: Final level:
After defeating the Leader, the stronghold will collapse. Pound the door two or three times and follow the path. Ignore the Gamma Elite and go directly to the place where you fought Madman and Half-Life. Wait until the boulders stop falling. Then, jump as if going out of a trouble zone. Defeat the return of Madman at the end and you are home free.
Jordan S.

Hint: Destroying helicopters:
If you get something to throw, pick it up then jump on the roof. Jump while on the roof. If done correctly, you can blow up the helicopters.
djgijdjgi.

Do a Super Sonic Clap while in a rage. Point in the general direction of the helicopter, do the attack, and it will explode. Note: This will not work if the helicopter is directly above you.
coco.

Hint: Destroying missiles:
Perform any kind of punch toward a missile when it is flying at you. If timed correctly, you can punch the missile and it will fly back to the soldier who shot it then blow him up.
CANONPOWER.

Hint: Defeating the Leader:
In the level where you meet the Leader, enable the "Invulnerable" code to always win. To make it faster, also enable the "Wicked punch" cheat. Punch him once as Banner and use a Sonic Clap as the Hulk to defeat him before help arrives.
Jordan S.

Hint: Defeating the parasitic Half-Life:
Half-Life is the first Boss you have to fight. His touch will drop your health. Get him into the generators. If you cannot; jump into the air and press Gamma. If you get him in a generator, you will fry him. His bar will return. Use the same strategies again. He will return after you defeat Ravage (Gamma thief).
Jordan S.

Hint: Return of Half-Life and Madman:
After you defeat Ravage and passed the Gamma Elites, you will reach a "door". Two old Bosses will return for revenge (Madman and Half-Life). Deplete half of one of their meters. Madman will escape, will return in the last level. This time, take down Half-Life. Use the Air Gamma trick. This time he stays defeated.
Jordan S.

Hint: Defeating soldiers with their shields up:
When you are in rage mode and encounter soldiers in their shields, do Hulk's Earthquake attack. Their shields will fall and you can take them out .
Dillardt13.

Hint: Defeating super robots:
The super-robots are the steel-made hide-weaponry guards inside the Desert Base. To defeat them, get them to clump together. Then, jump over the pack of them and run in a circle around them. They will use their energy-beam attack, but as you run it will hit more robots, damaging or destroying them all.
William Bether.

Hint: Waving soldier:
In challenge mode, go to time attack mode 1. Wait until the soldiers appear. Go to either side of the building. Pick up a soldier, jump, and throw him off the building. Sometimes another soldier will wave good-bye to him.
Francesco Massanova.

Hint: Soldiers and Alphas:
Unless you are Super Hulk, Alphas can withstand a full powered gamma blast, but soldiers cannot. You can tell them apart by the color of their uniforms.
Jordan S..

Hint: Paralyzer attack:
If you are facing a Boss or Gamma guard and you are angry; grab them, then press [Gamma] for a hurting and heroic move. This also works on Ross' robots.
Jordan S..

Hint: Tank shields:
When a tank has its shield up, you cannot go through it, but your Gamma Claps can. It also reduces the withstanding. You will find health and rage.
Jordan S.

Hint: Endurance mode:
Both endurance modes have 25 waves of enemies.
Jordan S.

Hint: Gray Hulk: Additional comments:
After you unlock the Gray Hulk, he will say things such as "And you think your car stereo is loud" and other comments.
simon jung.

Glitch: Get inside propane tank:
When you are Hulk and in level 3 or 4, find a big propane tank. Jump up and charge your punch. Make sure not to have done any damage previously to the tank or else it might explode. If timed correctly, you will be inside the propane tank. You will see Hulk inside with flames near his body. When you jump again, you will get out of the propane tank with a slight chance that it will explode if you land on it.
fridge928.

Glitch: Appearing enemies:
On the Return To Alcatraz level, get to where you have to break through some windows to get to the lower area on the other side. Destroy all three of the windows. Then, drop through any of them. You will see two enemies suddenly appear in twi of the windows. If you only destroy one of the windows and drop through it, these enemies will appear behind them (you cannot see them) and break the windows.
Matthew020192.