The map below represents the location of all of the health packs in the game.

The map below represents the location of all of the armor in the game.

The two maps below represent the location of all of the pigeons in the game.

If your car gets horribly damaged and stalls or refuses to start, call 911 on your cell phone. When they pick up, hang up your phone, and your car should start once more!

Here's a great way to get a free taxi fare. Hail a taxi and get inside, and head to your destination. Right before you get to your destination, bust out the back window and point your gun out of the window (using the corresponding controls). Doing so will freak the taxi driver out. He'll stop the car and run away, leaving you near your destination without forcing you to pay for the ride.

Head to an ATM anywhere in the city, and cause a traffic jam in the area. Wait for someone to approach the ATM and take money out of it, and then eliminate that person. The traffic jam should ensure that no ambulance can reach the injured person, so if you run a short distance away and return, you can grab the money that dead person dropped over and over again.

Almost always, when you enter a cheat into your cell phone, you can access it automatically from the phone's main menu ("Cheats"), so you don't have to enter these obscure phone numbers more than once.

Below is a list of how to reach 100% completion, and what everything in the game is worth (by percentage).

• Ninety Story/Procedural Missions - 68%
• Acquire each friend's special ability and do their activities - 10%
• Win at each activity and mini-game - 5%
• Find all random characters and complete their missions - 5%
• Kill all thirty wanted persons - 2.5%
• Complete all twenty vigilante crimes - 2.5%
• Complete all fifty stunt jumps - 2.5%
• Eliminate all two-hundred pigeons - 2.5%
• Complete all thirty car thefts - 2%

Fire trucks are awesome vehicles to use to cause complete and utter destruction in Liberty City. But, even these vehicles are susceptible to damage. Oddly, if the fire truck catches on fire and is about to explode, you can actually utilize the fire truck's very own water source to put its own fire out. Nice!

If a song is playing on your radio and you want to identify the artist and song title, insert (948)-555-0100 in your phone. You'll receive a text message with the information you seek.

To unlock the perks of friendship with any given person below, reach the friendship level listed.

Brucie - Brucie likes to bowl, drink, eat, go to strip clubs, shows, helirides and boating. If you get his friendship level up to 70%, you can call Brucie and he'll dispatch a helicopter to your location, allowing you to utilize it as you'd like.

Dwayne - Dwayne likes to go to strip clubs, eat, drink, go to shows and bowl. If you get his friendship level up to 60%, you can call Dwayne and he'll send you a car full of gang members that will follow you and help you out as you need them.

Little Jacob - Little Jacob likes to play darts, go to shows, play billiards, drink, eat, and go to strip clubs. If you get his friendship level up to 70%, you can call Little Jacob and he'll drive a car to your location full of guns that you can purchase from him.

Packie - Packie likes to go to strip clubs and shows, play darts, drink, bowl and play billiards. If you get his friendship level up to 75%, you can call Packie and he'll make you a potent car bomb that you can use as you need it.

Roman - Roman likes to go bowling, play darts, go drinking, eat, play billiards, go to shows and to strip clubs. If you get his friendship level up to 60%, you can call Roman and he'll send you a free cab to use anywhere in the city.

No matter the extent of your wanted level, if you can make it back to one of your safe houses and go to your bed to save, the cops will be automatically called off. You don’t even have to actually save – you can just access the save menu and then cancel out. As long as you reach this menu, then you won’t have to worry about the cops chasing you once you go back outside.

Here's something funny to try. During your adventure through Liberty City, you may find phone numbers written in inconspicuous places, such as on the side of a building or in the subway. If you dial these numbers, you'll usually get someone on the other end who you can subsequently prank.

Head to the Statue of Happiness on Happiness Island via helicopter. Have the helicopter drop you off on the very top of the statue. You'll find a sign up there that states "No Hidden Content Beyond This Point", but it's a lie. If you head inside of the statue from this area, you'll find an actual beating heart inside the statue. How ridiculously creepy!

If you boost a fire truck, press the fire button while driving around. This will allow you to shoot the super-powerful water cannon at anyone around you. Watching people react to getting shot with high-speed water is hilarious.