Grand Theft Auto 4 Cheats for PC

This weapon is located at Happiness Island which means you'll need to get hold of a helicopter or boat to get there. If either of those two options aren't availabe you can always swim there. At the island go inside the first door of the 'Statue of Happiness' and there will be a security guard there with a carbine rifle. All you've got to do then is Kill him to get the Carbine rifle.
This weapon cannot be fired from cars and can kill with two headshots in Multiplayer and Single player and is highly effective during Team Deathmatch.

At the [email protected] Internet Cafe log into a computer and enter the URL 'www.libertycitypolice.com' and select the 'Database' tab which is located at the bottom of the homepage. When you do this you will be able to view the Liberty City Police department files on ALL the characaters in the game.

You can increase your health level if it is low by jumping into an ambulance.

The following list must be completed to be able to get a 100 completion.
Complete ALL 90 story and procedural missions to get 68 complete.
Excluding Roman or Dwayne get ALL your friend's special abilities and do ALL their activities to get an additional 10.
Beat friends or computers at every activity to get an additional 5.
Find ALL random characters and complete their missions to get an additional 5.
Complete ALL 30 car thefts to get an additional 2.
Complete ALL 50 stunt jumps to get an additional 2.5.
Complete ALL 20 vigilante crimes to get an additional 2.5.
Kill ALL 30 people on the list to get an additional 2.5.
Collect ALL 200 pigeons (flying rats) to get an additional 2.5.

When you get 100 completion in the game there is no longer an ammo limit which means you can keep firing away in a gunfight without worrying about how much ammo you have left.

The following vehicles become available in the game when you complete the corresponding task.
Unlock Rastah Colour Huntley SUV:
Complete 10 Package Delivery missions.
Unlock Annihilator Helicopter:
Kill ALL 200 flying rats.

The following features can be enabled by going to an internet cafe and typing the corrresponding URL.
Instant 5-Star Wanted Level:
Www.littlelacysurprisepageant.com
Armor, Weapon, Vehicle, Health, Pigeon, Ramp/Stunt and Entertainment Locations:
Www.whattheydonotwantyoutoknow.com

Enter any of the following codes when Roman has given you his old mobile phone to activate the corresponding effect. You don't have to wait long before you receive the phone and the codes can be entered as often as you like.
To enter the codes into the mobile phone press 'Up' to raise the phone higher and reveal the complete keypad. Then use your controller to select the set of numbers according to which cheat you want to use, after you have entered the code the cursor moves to the dial button, just press 'Up' again and if successful you will see a message 'Cheat Activated' on the screen. When a code has been entered correctly, a new 'Cheats' menu option becomes available on your phone under 'Options' which allows you to access the cheats without having to enter the phone number again.

It is advised not to save your game after you have enabled a cheat code.
Full Health:
Call 362-555-0100
Full Health and Ammunition:
Call 482-555-0100
Reset Wanted Level:
Call 267-555-0100
Wanted Level Up One:
Call 267-555-0150
Weapons 1:
Call 486-555-0100
Weapons 2:
Call 486-555-0150
Change Weather and Brightness:
Call 468-555-0100
Spawn Annihilator Cop Helicopter:
Call 359-555-0100
Spawn Cognoscenti:
Call 227-555-0142
Spawn Comet:
Call 227-555-0175
Spawn FBI Buffalo:
Call 227-555-0100
Spawn Jetmax:
Call 938-555-0100
Spawn NRG-900:
Call 625-555-0100
Spawn Sanchez:
Call 625-555-0150
Spawn SuperGT:
Call 227-555-0168
Spawn Turismo:
Call 227-555-0147

To input these codes (with default controls) press the up arrow once to bring up the cell phone and once more to enter manual dial mode. Then dial one of the numbers below for the effect mentioned. (note that the first time you put these in you need to wait for it to ring, after that there will be a cheats menu on your phone and as soon as you choose it in that menu it takes effect.
Remove wanted level: 267-555-0100 (i think you can only put this in the first time while you have a wanted star, best to do it somewhere the cops can't get you so you have time)
Full health/armor/and some ammo (it also gives a weapon set, if you are missing weapon types, and changes any you do have to weapons from that set): 482-555-0100
Spawn police helicoper(annihilator): 359-555-0100
Spawn turismo: 227-555-0147