True Crime: New York City

Unlimited ammunition:
Hold L + R and press B, X, A, X(2), Y at the CompStat/Map screen.

Unlimited endurance:
Hold L + R and press B, X, A, X, A, B at the CompStat/Map screen.

Double damage:
Hold L + R and press A(2), X, A(3) at the CompStat/Map screen.

$1 million:
Hold L + R and press X(2), Y, X, Y, X at the CompStat/Map screen.

Super cop mode:
Hold L + R and press Y, A, Y, A, Y(2) at the CompStat/Map screen. Do a badge warning to completely lower your Rogue status.

Ultra easy mode:
Hold L + R and press B, X, A(2), Y, B at the CompStat/Map screen.
tvigea rfalnmo ln, yuhrl.

Redman Gone Wild mini-game option:
Hold L + R and press Y, A(2), X, A, X at the CompStat/Map screen. Alternately, get a 100% game completion. Go to the location given by Redman when he calls.

All music tracks:
Hold L + R and press B, X, B, X at the CompStat/Map screen.

Fights open:
Hold L + R and press X(2), B(2), X at the CompStat/Map screen.

Street Races open:
Hold L + R and press Y(2), A(2), Y at the CompStat/Map screen.

Zombie mode:
Hold L + R and press B, Y, X, A, X, A at the CompStat/Map screen. Marcus will have no head, arms, or legs, with blood appearing from the stumps. Repeat the code to only have his torso appear.

Ghetto city:
Hold L + R and press A, X, A, Y(3) at the CompStat/Map screen.

New costume in Puma Store:
Hold L + R and press Y, A, B, X at the CompStat/Map screen. Alternately, collect all ten pairs of Puma shoes hidden in the city, then go to the Puma Shoe store to get the Puma Shoes costume.

Debug mode:
Press Start to pause game play, then enter the CompStat/Map screen. Quickly press L + R, Right, then hold L + R. The music player should appear over the CompStat to confirm correct code entry. Release L + R then press Left to display the debug mode menu.

Invincibility:
Enable the "Debug mode" code. Enter the debug menu and scroll down to "Debug Combat" followed by "Default". Press Right so that it now appears as "No Player Damage". Marcus will now be invincible. Note: You still will fall down when something explodes and run around when on fire.
Shinori.

Vehicle ranks:
Reach the indicated rank to have the corresponding vehicle available in the police garage.

Detective Rank 1: 6.5L V8 Custom SUV
Detective Rank 2: 5.4L SC V8 Coupe
Detective Rank 3: 2.5L L4 Sedan
Detective Rank 4: 6.0L V8 Coupe
Detective Rank 5: 3.5L V6 Sedan

Weapon and ability ranks:
Reach the indicated rank to have the corresponding weapons and abilities available in the police armory .

Detective Rank 1: 5.56mm Carbine, 7.62 Auto Sniper, Flashbang, Slo-Mo Dirve x2
Detective Rank 2: .45 Special, Tactical Shotgun, 5.56mm Bullpup AR, Sledge Hammer, Precision Aim Assist
Detective Rank 3: 4.6 MM PDW, Assault Rifle, Tranquilizer, Sunt Baton, Zoom 4x
Detective Rank 4: Stun Gun, 9MM SMG, Standard Shotgun, Slo-Mo Dive

Driving skill ranks:
Reach the indicated rank to have the corresponding weapons driving skills available in the police garage.

Detective Rank 1: Nitro Boost
Detective Rank 2: Side Wheelie
Detective Rank 3: Peel Boost
Detective Rank 4: Switchblade
Detective Rank 5: Insta-turn

Hint: Taking out key suspects:
To disarm key suspects easier without killing them, raise your Detective level by solving street crimes to unlock the Taser pistol and Tranquilizer rifle (found in police station's basement armory). These work well for safely capturing key suspects without killing them accidentally, and is much easier than trying to get an aim on their arms or legs for a "neutralizing shot".
Aaron Mick.

Hint: Neutralizing criminals:
To neutralize a criminal person that is running, take out your stun gun and use it until his or her health is gone. You can then arrest him or her.
Frank.

Hint: Getting criminals to surrender:
Enemies are more likely to surrender if you fire a warning shot from a gun larger than theirs. You can then proceed to arrest them without starting a gunfight. Note: This does not always work.
dcumpson.

Hint: Fighting styles:
If you are having trouble completing a fighting mission where you must fight thugs hand-to-hand, it is best to drive around to different Dojos when not on a mission to learn different fighting styles. Some styles are better used on some opponents than others. The best styles are Thai Boxing and Tae Kwon Do. They seem to be effective on a wider variety of opponents and can defeat more fighting styles than other ones. Also, do not overlook your default "Brawling" fighting moves as they can prove very effective against some of the fancier martial arts like Wushu. Switch between styles while in combat to find the best one for each situation. If you can score hits with combos of three or more moves on one opponent without them blocking any of your hits (or stunning them), then your style is better than theirs. Also, during the "fight club" mini-missions you can sometimes get a hint as to what styles your opponents are going to use by the little gestures and moves they make before the beginning of a match.
Aaron Mick.

The best fighting style is the simple "knock down and boot!" strategy. To do this, purchase the skill from the dojo where you change your normal radial attack into a roundhouse kick. Then when you are fighting someone, always attack first with a roundhouse (A + X) to knock them on the floor. Then, just repeatedly kick them while they are on the floor. You also could grab them up (B) and try a grapple on them.
Gaffa.

Hint: Fighting strategy:
When fighting hand-to-hand or unarmed against multiple opponents, do not let yourself get surrounded. Even though you can block attacks, you can still get hit from behind. Try to single out opponents and focus on one at a time. Block anytime your not on the offense and strike immediately after an opponent attacks (and you block). Block any moves thrown at you, then quickly to stun the opponent with three quick strikes. Then, immediately follow up with three heavy strikes to knock them to the ground. This gives you time to run over and kick them while they are down, or focus your attention on other opponents. Make sure you learn the Dojo move for the ground attack so you can knock away opponents around you and get up quickly if you find yourself kissing the pavement. If you are fighting opponents that are slower than you or are constantly using heavy attacks, do a counter-grapple move. If you happen to get grabbed by an opponent or knocked to the ground and they are on top of you, move the Left Analog-stick back and forth to break free or do a counter-attack. If your opponents are armed for melee in any way (with debris, pieces of the environment, or with any hand-to-hand weapon), immediately back off and look for a weapon. Chances are you fill find one laying around if your opponents have one. It is important you match your opponent, otherwise you cannot block their attacks. If possible, out-do them weapon-wise. If they have a club, grab a blade. If they have a blade, grab a blade and a club. Never forget you can fight with more than one melee weapon.
Aaron Mick.

Hint: Defeating hand to hand combatants:
Another way to defeat some enemies is to grab them, attack with either A or X button, then kick them until they get up. This is done when not in stealth, but when in hand to hand combat.
Miscelaneous Gamer.

Hint: Defeating President Lincoln:
When fighting President Lincoln makes sure that you have bought the tranquilizer gun at the police armory when you have reached the second rank. Stand in the room with all the thugs. Shoot out the window and zoom in on Lincoln across the scaffold. Shoot him until he passes out. Then, interrogate him.
nick bissonnette.

Hint: Sour Candy mission: Easy completion:
In the Palermo mission "Sour Candy", follow Candy up the climbing wall to the track. Instead of starting the race, go in the opposite direction. For the first two sets of hurdles, break the ones in the center lane by running into them. Then, break the last two sets of hurdles on the inside lane of the track. This will allow you to run in the race and not have to jump. Candy will be forced to jump over the hurdles slowing her down, so you can catch her more easily.
Alyssa Holmes and Matthew Boltas.

Hint: Non-fatal shots:
When arresting people without killing them, go into aim mode by clicking Right Analog-stick. Put your sight over either their arm or leg, wait for it to turn blue, then shoot. They will fall to the ground, and you can then arrest them. This is useful for increasing your Good Cop rank.
Kastro187420.

Hint: Faster shotgun reloading:
when using a shotgun, slow reloading can be a big problem. When you start to reload a shotgun and just stand there, it is very slow. Start running around to reload almost three times as fast.
Gary Linder.

Hint: Recommended vehicles:
The best vehicles to use at Detective Rank 2 is the 5.4L SC V8 coupe; and at Detective Rank 4 the 6.0L V8 coupe. If you use the 6.0L coupe, make sure to take it to a garage and get a street upgrade. Also, if you find one of the bullion vans driving around, hijack one. These will push any car out of the way, and in one hit you can sometimes put a car on black smoke. If you are stuck on the last driving arena mission (one lap around Central Park), just keep hitting her car in this truck to get her stuck for an easy win. The only problem with this vehicle is cornering. Do not be afraid to use this vehicle like a rhino.
Gaffa.

Hint: Fire any weapon in vehicle:
Usually you are only able to fire your .32 auto (the small default pistol) while in a vehicle and cannot use other weapons you have while driving. To use any weapon of your choice in any vehicle, enter or commandeer a vehicle as usual, but then press Down to switch from hand-to-hand combat to firearms and quickly press Left or Right to select any weapon you have in your inventory before Marcus gets into the car. You can now use the weapon of your choice while driving around. This is especially useful if you have a high-powered or automatic weapon with you while chasing down suspects fleeing in vehicles.
Aaron Mick.

Hint: Get cops to stop shooting you:
Sometimes, when you are in your street clothes and shoot at someone in front of a cop, the cop will start shooting at you. To get them to stop, simply turn towards them and press Back to flash your badge at them. They should then stop shooting at you.
Kastro187420.

Hint: Provoke citizens to fight you:
This is a very good way to clean up all precincts quickly, without getting a Bad Cop rating. Get in a car and ram into another car that someone is driving. The driver will get out of their car angry and start provoking you while throwing a big fit. Get out of your car while they are still throwing a fit and wait until you see a health bar over their head. You can now beat them down and arrest them for a quick and easy three Good Cop and three Career points. You can repeat this until you clean up the area.
Phantomstranger.

Hint: Character upgrades:
As your rank gets better (5 being the worse, and 1 being best), you can buy better upgrades for your character at the Police Department Armory, such as better zoom for your guns, or a more slow-mo dive. You can also purchase new guns to use. The guns will be in the trunk of your police car that you get from the garage.
Kastro187420.

Hint: Easy money:
Walk out in front of a car and press Back. The driver will get out. Walk up to the person and press Back again. You will write them a ticket and summon them to court. You will get $10 each time this is done, but also one Bad Cop point.
Smoke_eater132.

Go into a store, extort them, then come out. Walk back in and repeat as many times as desired to get more money.
Hattie West.

Hint: Easy ranks:
If you do not mind earning Bad Cop points, use the following trick to rank up detective levels easily. Go to a place where there are lots of people, such as Central Park. Frisk as many people as you can, plant evidence, and arrest them. You will get one Bad Cop point if you arrest them correctly. Also, you will get three career points every time you do so. It should only take about a half hour at the most to rank up a level.
Scott Thomas.

Use the following trick to get easy arrests without Bad Cop points. Go into a car dealership or a dojo and frisk all the customers inside. All the customers will have something for you to take as evidence. Arrest them for extra career points.
Dylan De Carr.

For easy arrests, run and tackle people, then punch them about three times. Get off them and someone near or that person will start to fight with you. Knock them out and arrest them.
greg Prior.

Hint: Keeping weapons:
If you get a heavy weapon like a parking meter, when you try to switch weapons you will drop it. If you want to keep it, press Back and Marcus will flash his badge. While he is doing that, press D-pad Up and the weapon will be in your inventory.
Ozzi.

Hint: Reload stun gun:
Commandeer any police cruiser, open the trunk, and you can then reload your stun gun. This can be done repeatedly whenever the gun is low or empty.
Avatar Alien.

Hint: Reloading:
There are two ways to reload your ammunition. The first is by accessing the trunk of any car that you own. This also gives you access to your personal armory. The other way is to get a police car then access its truck. Using the police car will refill all your weapons but will not give you access to your personal armory.
Ryan Sanders.

Hint: Reducing crime rates:
If you are trying to reduce precinct crime rates, go into a pharmacy. When you get inside, frisk everybody there. The following are the predicted amounts of people holding contraband.

High crime rate: Approximately everybody.
Medium crime rate: Approximately 50% of the people.
Low crime rate: Approximately two to five people.

Start at the back of the pharmacy. Work your way to the front of the pharmacy by arresting people with contraband. If the person is clean, walk them to the front of the pharmacy and release them there. Hide behind the back shelves when you arrest him or her so that no one else will see you. Do this so that nobody with contraband runs out of the place.
danieltow.

Hint: Lower Rogue meter:
To allow your rogue meter to cool down, just enter any subway station. Cops will not follow you down and you will be safe.
Ryan Sanders.

Hint: Kill without filling the Rouge meter:
Kill a group of people to fill your Rogue meter. Once the cops come after you, let them kill you. After you are put you on street patrol, leave the station. Enable the "Super Cop" code, and you can now kill as much as you desired without your Rogue meter filing.
TRIPLEKKKX.

Hint: Blow up cars:
Click the Right Analog-stick and point at the back of a car near the license plate until it turns red. Shoot and it will blow up. Note: You may get 10 Bad Cop points. This will not work trucks, buses, fire trucks or anything similar.
zachk.

Hint: No motorcycle wrecks:
Pop a wheelie and do not stop. Cars will not make you fall off or slow down much.
trandjfish.

Hint: Keep car door open after you jump out:
When you jump out you will find that your door is stuck. To keep it open, get in on the passenger side.
Brandon Nunya.

Hint: Redman Gone Wild mini-game: More time:
An easy way to get more time is to kill people. It is impossible to complete it by just driving. You must get out and shoot them.
Ballndahoop91.

Hint: Grand Theft Auto reference:
When you get the option to start driving taxi missions, Marcus comments that he cannot believe it and says "Next thing, I'll be flying remote control toys and shit." This is obviously a reference to all the RC car/plane/helicopter levels in the Grand Theft Auto series of games.
Geoff.

Hint: Puff Daddy and Jennifer Lopez reference:
One of your crime calls on your police radio will be a reference to the Puff Daddy and Jennifer Lopez incident in Club New York, a midtown Manhattan nightclub on December 27, 1999. "Puff Doggy (Puff Daddy) and Jo Loleta (J.Lo, Jennifer Lopez) have seen escaping the scene in SUV, apprehend suspects."
Gustavo Marron.

Glitch: Wrong subway map:
When you go into the subway, walk from the stairs down to the other end of the platform. There will be a wall, and on the wall is a subway map. However, if you look close, you can see that this is not the NYC subway map; it is actually the map of the Boston, MA public transit system, the MBTA. The words are not there, but the shape of the lines, and the colors are 100% accurate to Boston.
John Mastrorillo.

Glitch: Swim in air:
Go into any subway. Wait until the subway train arrives, and when it is slightly past you, run into it until the screen turns gray then release the Analog-stick. After a while, Marcus will appear in the middle of the screen swimming. If you move the Analog-stick, he will die and you can repeat the glitch.
Ezfu2c.