1: To give Niko an Armer dial 3625550100.
2: If you want to restore Niko's Health use this 4825550100
3: For weapons #1 Handgun, Shotgun, MP5, M4, Sniper Rifle, RPG, Grenades, Baseball bat, use 4865550100 this number translates into GUN-555-0100.
4: To remove wanted level (Blocks "Walked free" achievement): 2675550100
5: Raise Wanted Level (Adds a star to Niko's wanted level): 2675550150, number shall translate into "COP-555-0150".
6: If you want to change weather or brightness 4685550100, number shall translate into "HOT-555-0100".
7: Spawn Annihilator: 3595550100, shall translate into "FLY-555-0100".
8: Spawn Jetmax: 9385550100, number translates into "WET-555-0100"
9: Spawn NRG-900: 6255550100, number shall translate into "MBK-555-0100"
10: Spawn Sanchez: 6255550150, number shall translate into "MBK-555-0150".
11: Spawn FBI Buffalo: 2275550100, phone number shall translate into "CAR-555-0100".
12: Spawn Comet: 2275550175, phone number shall translate into "CAR-555-0142".
13: Spawn Turismo: 2275550147, number shall translate into "CAR-555-0147".
14: Spawn Cognoscenti: 2275550142, phone number shall translate into "CAR-555-0142".
15: Spawn SuperGT: 2275550168, number shall translate to "CAR-555-0168".
16: Restore Niko's Health: 4825550100 (this number shall translate to GTA-555-0100, this code also prevents Cleaned the mean streets achievements from being earned.
Dial "3625550100" into the cellphone. Note: This phone number translates to "DOC-555-0100". This code prevents the "Cleaned The Mean Streets", "Finish Him", "One Man Army", and "Walk Free" achievements from being earned.
First of all find an ATM machine then you have to create a traffic jam in the area, now look for some one cashing out at ATM and kill him or her. Block nearby roads so that ambulance cannot find and approach them for aid, take the money which victims drop on ground and then run a short distance and then come back to pick more money from same place, you can do this as many times as you want, to get even more money find and kill people cashing out at atm.
To Repair an engine
Call 911 if your engine breaks down and it start again.
To reveal all weapons, health, armor, vehicles, pigeons, entertainment and ramp or stunt locations enter www.whatthedonotwantyoutoknow.com in the in game computers to see maps.
One Man Army Achievements
Walk by the train path which is heading towards 2nd island, to track this path approach bridge which takes you to the 2nd island and has a train path underneath. When you are in middle you should be able to have up to 6 start wanted level. Then you have to stand on train track for 5 minutes to get the achievement. Police cannot shoot you as they are on the bridge right above you also the helicopters.
Hundred Dollars For Themes and Tones
Reach nearest cyber cafe after getting the cell from play boy x. Purchase all of the ringtones and themes from the tones site then log out of the system and you will find that you have only spent $100.
To Avoid Toll Booths
To save 5 dollars and hassle use emergency vehicle with sirens on and attendant will open gates.
leave the mission area and go to Cluckin Bell and the hotdog stand. Eat food to regain your health. Its very useful when on some missions you cannot find health packs. Take taxi to such locations if you cant find the car.
Get away From Police
While running away from the cops barely leave leave the circle which you see in your radar and sit their for 5 seconds. They look for you in that circular area and if you leave the circle and other cop sees you it shall change.
Headshots count alot and some times its harder to get them but with some practice you can gain some perfection. Hit Auto Aim and then use right side analog stick to move auto aim targets around your victim's body, now barely move the stick when you are shooting and it shit bullets in their heads and chest and instant kill.
Swim under city
Go to the north part of the map, just northwest of Butterfly Street in Bohan. Once there, get down to the outskirts of the land and walk towards the corner between the brick wall and the cliff. You can walk through the invisible wall. Lookup towards the city to see the city from below. You can also continue onwards and swim under the city.
Launch up stairs
When walking or running up stairs, jump at the first step to skip or sometimes launch yourself up the stairs.
Use a computer at a TW@ Internet Cafe to go to the Liberty City Police Department site at "www.libertycitypolice.com". Click the "Database" tab at the bottom of the home page to get information on all characters, including Roman and Niko.
You can Date
You can date people from the in-game Internet. When looking at their profile click "Date". You then have to wait a few in-game days for a negative or positive reply via email. If your date accepts, reply to their email and meet them.
Tossed by friend
Invite a friend to hang out with you. Gently nudge him with your car, enough to knock him over but not enough to hurt him. After a few times, he will open the and throw you out.
Hint: Armor Locations
Below is the map which shall help you locate Armor Locations.
Hint: Health Locations
Below is the map which shall help you locate Health Locations.
Hint: Stunt Jumps Locations
Below is the map which shall help you locate Stunt Jumps Locations.
Hint: All Pigeons Locations
Below is the map which shall help you locate Pigeons Locations.
Hint: Hangout Locations
Below is the map which shall help you locate Hangout Locations.
Hint: Encounters Map Locations
Below is the map which shall help you locate Encounters Locations.
Hint: Email Cars Locations
br>Below is the map which shall help you locate Email Cars Locations.
While driving you will waste alot of time so to avoid it call a taxi it shall take you to your desired destination, you can also skip through taxi ride, which allows you to travel whole city in 10 seconds, this can be done in missions as well.
Helicopter along with Rockets
If you want to unlock the helicopter with rockets you have to collect all 200 pigeons.
Unlock specific characters friendship ability by gaining mentioned friendship level.
1: BRUCE likes to play bowling, easting food, drinking, strip clubs, helirides, boating and his special ability is unlocked at 70%. If you call Bruce he will come up with his chopper which shall help you travel faster in different parts of city.
2: PACKIE enjoys Strip clubs, shows, bowling, drinking, eating and his special ability is unlocked at 75%. To make a car bomb call packie and he will make it for you.
3: ROMAN has interests in bowling, drinking, eating, darts, pool, strip club, shows and his special ability unlocked at 60%. If you call Roman he will send you a cab for no charge.
4: LITTLE JACOB likes shows, darts, strip club, eating, drinking, pool and his special ability unlocked at 60%. Call jacob and he will come with a car full of guns for you to buy.