Manhunt

God mode:
Successfully complete the game under the Fetish difficulty setting, then press Down(2), Circle, Up, Square, Triangle, Square, R2, Up(2), L1, Triangle at the title screen. The message "God Mode" will appear at the bottom of the screen to confirm correct code entry. Note: The game cannot normally be saved while this code is enabled.

Use the following trick to save the game while in God mode. Enable the God mode code, then finish a few levels with a three star rank or higher until you get a bonus level (Hard as Nails, Brawl, etc.). Then, play one of the bonus levels, die, and quit. This will reset the codes you enabled. Next, play any easy level and save at one of the check points. You will keep all the stars that you have earned with the cheat codes.
Denis Serezlic.

Cheat mode:
The following codes have no effect until you complete the both levels with at a five star rank under the hardcore difficulty setting to unlock them. Each code has two parts, each of which are unlocked by a specific level (for example, at the end of level 1 and level 2 with at least a three star rank). When this is done, one half of a code will appear at the bottom of the image that is now unlocked in the "Bonus Features" menu. Once both halves (images) are unlocked, that specific code can now be activated in any level in the game.

Helium Hunters:
Press R1(2), Triangle, Circle, Square, L2, L1, Down at the main menu. A message will appear to confirm correct code entry. Complete the Strapped for Cash and View Of Innocence levels to unlock this code. Enemies will have high pitched voices.

Invisibility:
Press Square(3), Down, Square, Down, Circle, Up at the main menu. A message will appear to confirm correct code entry. Complete the Trained To Kill and Border Patrol levels to unlock this code.
david black.

Fully Equipped:
Press R1, R2, L1, L2, Down, Up, Left, Up at the main menu. A message will appear to confirm correct code entry. Complete the Drunk Driving and Graveyard Shift levels to unlock this code. You will have all weapons.
gunner hanks.

Monkey Skin:
Press Square(2), R2, Down, Triangle, Square, Circle, Down at the main menu. A message will appear to confirm correct code entry. Complete the Press Coverage and Wrong Side Of The Tracks levels to unlock this code.

Piggsy Skin:
Press Up, Down, Left(2), R1, R2, L1(2) at the main menu. A message will appear to confirm correct code entry. Complete the Key Personnel and Deliverance levels to unlock this code.

Rabbit Skin:
Press Left, R1(2), Triangle, R1(2), Square, L1 at the main menu. A message will appear to confirm correct code entry. Complete the Kill The Rabbit and Divided They Fall levels to unlock this code.

Regenerate:
Press R2, Right, Circle, R2, L2, Down, Circle, Left at the main menu. A message will appear to confirm correct code entry. Complete the Fueled By Hate and Grounds For Assault levels to unlock this code.
gunner hanks.

Runner:
Press R2(2), L1, R2, Left, Right, Left, Right at the main menu. A message will appear to confirm correct code entry. Complete the Born Again and Doorway Into Hell levels to unlock this code. This code allows unlimited sprint.

Silence:
Press R1, L1, R2, L1, Right, Left(3) at the main menu. A message will appear to confirm correct code entry. Complete the Road To Ruin and White Trash levels to unlock this code. Enemies will no longer be able to hear you.

Super Punch:
Press L1, Triangle(3), Circle(3), R1 at the main menu. A message will appear to confirm correct code entry. Complete the Mouth Of Madness and Doing Time levels to unlock this code.

Alternate title screen:
Successfully complete the game, then press L1 + L2 + R1 + R2 at the title screen to hear a backwards message being whispered. Note: A new segment of whispering can be heard each time the buttons are pressed.

Hard as Nails mini-game:
Successfully complete levels 1 through 5 five a three star or greater rank.

Brawl Game mini-game:
Successfully complete levels 6 through 10 five a three star or greater rank.

Monkey See, Monkey Die! mini-game:
Successfully complete levels 11 through 15 five a three star or greater rank.

Time 2 Die mini-game:
Successfully complete levels 16 through 20 five a three star or greater rank.

Hint: Opening gates:
When on a level that requires a crowbar to open a gate, just shoot the lock with a gun. You can now walk through the gate.
Boyalien1.

Hint: Killing Piggsy:
To finish off Piggsy, after you stab him three times go up the stairs and lure him onto the grate at the top level. The grate will bend the first time and he will run away. Lure him back upstairs and onto the grate for a second time and he will fall through. Make sure that you are also not on the grate or you will suffer a similar fate as Piggsy.
Iggypoo777.

Hint: Killing the Rabbit:
When you reach the part when the rabbit says "Oh crap, he's after my key" and you must get to the tower with all the SWAT members, just run straight through that part and into the tower. Go up until you can hide behind a wall and aim up to where their heads will appear when they come towards you. Wait and kill them. When that is done, go up the steps and you will reach a certain point to where the rabbit will be just above your head with a SWAT team member guarding him. Lean towards the left side of the wall and go up slowly. Go up just enough so that you can see the rabbit's head. It will require about five or six head shots to kill him. Shoot it in the head twice with a shotgun, or any other gun you desire. The SWAT guard will be alerted. Run down the steps a short distance and do the same thing as before -- wait for his head to appear and shoot. Repeat the process of going up and revealing just the rabbit's head and shoot. After he is dead, get the key and go out of the tower balcony. Do not get the sniper -- it is too risky and uses up the ammunition that you earned. Run around at least two times then go back in the tower. Wait behind the top of the steps for the men. Aim down in the middle so that when they walk up, you can easily kill them with one head shot. There are at least ten men. Then, leave the tower and go towards the gate.
Xbxgmr26.

In order to kill the rabbit easier that just shooting it several times, after you have reached the tower and you have ascended to the top, slowly peek around the wall until you see that you are on the last flight of steps. When you do, place your back to the wall by pressing Triangle and load your shotgun. Press X to make your character tap the wall and get the attention of the SWAT team member. He will slowly come down the stairs. When he does, he inadvertently falls down a few steps, which gives you time to press L1 to pop out from the wall to shoot and kill him. He will drop his sniper rifle on the steps. Slowly ascend the steps just enough to get the sniper rifle. After you have it, back up just enough against the wall to your left as your facing the steps, then turn to the right and look up to see the rabbit's head. Focus on him and shoot him in the head. If he does not see you, it should only take one shot to kill him. If he sees you, two shots are needed.
the duke.

Hint: Born Again level: Early sawed-off shotgun:
After you are let out of the execution room, you will soon find yourself in a basketball court where you have to defeat several gang members that are sent out after you. There is an opening in the fence around the court where you will see a posted sign reading "Vote Congressman Matthew R. Dione for Willington Mayor". Under the sign in the tall grass should be a sawed-off shotgun.
Matt D.

Hint: Doing Time level: Hidden shotgun:
After the sequence with Fug running along the prison cells screaming "Fug gonna finish this. Fug make you sorry!", kill him and the other hunter that comes downstairs. They go up the stairs. Once you are on the prison floor turn left and you will see a room on the other side of the bars. In this room is a shotgun. The shotgun only appears when you bring Starkweather the head of the man whose body you are supposed to take to the guard room on the Mouth Of Madness level. This is the secret gift he leaves for you in the next location.
jonny cooper.

Hint: Grounds For Assault level: Sawed-off shotgun:
There is a shotgun in the padlocked closet. After you get the crowbar, go back to where you killed the third Wardog in the level (by door with the rope that you have to cut with the machete). Use the crowbar on that padlock to get a sawed-off shotgun that you can use throughout the level.
papoppop.

Hint: Kill The Rabbit level: Live body:
Before the room where you have to put the body on the plate to open the door, there is a morgue-like room with a body in a bodybag on a trolley. Walk past it a few times and it will bolt upright and make a sound.
jonny cooper.

Hint: Mouth Of Madness level: Bonus item:
In this level, you must kill the smiley hunter on the tower and bring his body to the guard room. Kill the hunter on the tower and make sure to cut off his head. However, do not bring his body to the guard room (just his head). An intermission sequence will show you entering the guard room with only the head. Starkweather will say "For bringing this head I will leave you a little gift in the next location". Look around for the unknown item.
Famhod6984.

Hint: Easy five star rating in hardcore mode:
Successfully complete the game in Fetish mode. Then, enable the "God mode" code and play the game in hardcore mode. You will be invincible. Execute everyone. If you are seen, run into the shadows, execute him, then run through the level.
Boyalien1.

Hint: Gruesome view:
When the victim is on the ground begging for his life and before you finish him off, hold R3 and start attacking. The camera angle will then show a partial close-up view through the eyes of the victim, with you swinging away.
Matthew Boltas.

Hint: Grand Theft Auto 3 references:
Towards the end of the game, the journalist on television doing a news report about Starkweather mentions Carcer City's police chief Gary Schaffer and his involvement with Starkweather. In Grand Theft Auto 3, on the Lips 106 radio station, a news report states "In nearby Carcer City, police chief Gary Schaffer's was cleared of corruption charges." It then continues to say "Let's hope those missing witnesses turn up soon."
Jamie Weir.

On the Drunk Driving level, when you get to the graveyard you can see a destroyed Stallion.
Dan Murray and Jack Clark.

Hint: Grand Theft Auto: Vice City references:
In the journalist's apartment, in the one room is a blue and white shopping bag with the words "Gash" written on the front of it. This is the same name of a department store in the North Point Mall in Grand Theft Auto: Vice City.
Jamie Weir.

In the Fueled By Hate level go to the junkyard. The car crusher and its surroundings are the same from Grand Theft Auto: Vice City's junkyard.
Boyalien1 and Tdgsk8.

In the View Of Innocence level, on the second floor in one of the shoot out locations, look for a little counter with the words "Tarbrush Café" and a little picture of a coffee cup. The Tarbrush Cafe is the location where Tommy and Lance had to destroy in the Cop Land mission in Grand Theft Auto: Vice City.
Famhod6984.

In the introduction when the camera is moving, there is scene where it shows a drug store called Ryton Aide. In Little Havana in Grand Theft Auto: Vice City, there is a drug store named Ryton Aide shaped similarly.
Adam.

Hint: Grand Theft Auto: San Andreas reference:
While playing through Manhunt, in many scenes are drink machines that have Sprunk Cola on them. This is the drink that is featured in Grand Theft Auto: San Andreas.
David Edmonds.

Glitch: Exploding head:
In many instances a foe can lose his head in one of the death animations, such as baseball bat level 3 or wire level 3. If you smack a downed opponent in the head, their head will basically explode. If you have severed their head prior then go to smash it in, it will still explode as if the head were still attached to the body.
t3rm.

Glitch: Transforming head:
Hit a save point with a throwable head with you. If you die, it will become a head with a bag wrapped around it.
Wizard OfTheHood.

Glitch: Floating chainsaw:
When you kill Starkweather and Cash puts the chainsaw through his head, Starkweather's corpse falls over. Cash will then put the chainsaw in his stomach. However, sometimes he does not directly get it on his body and you should see the chainsaw floating in mid-air.
seiken_jester.