Cheat:

Do the cheat for a tank (giveusatank) then type the flying cheat (chittychittybb)
and turn the shoot thing thats on the tank round so its shooting the back then
keep shooting and you will take off and just keep shooting and you can travel far
but its great fun and funny

Free car repair:

You can have any car you want repaired for free, if your favourite car is looking
a bit worse for ware after that cop chase, just drive to your hideout and place
the car in your garage, get out and let the door close, then step foreward to
open the garage door again, and hey presto! a brand new car (it's even been
polished). This can only be done when you're not on a mission.

Hints - More cars in Garage:

You can fit more than two cars in your hideout's garge than you are supposed to. In
the second district the garage should only hold two cars, but you would be able to fit
four in, five if they are small cars.
Park the first two cars beside each other next to the wall then park each car after
that in front of the door, get out of the car and the door will open then quickly
drive the extra cars in before the garage door shuts, therefore you can save all
the cars in the garage.

Custom music:

Copy some of your favorite MP3 files into the "mp3" folder in the game folder. Start
the game and you will have a new radio station titled "mp3 player". Choose it to hear
your own selections.

Taxi hint:

Get a taxi. Select the taxi driver mission. Complete 1st fare AND, wait! Go collect
next fare, but make sure he/she close car door on end of 0:00 second! Now you gotta
unlimited time for all next fares. Trick is over when you cancel taxi driver mission
or exit taxi vehicle. Thing is really hard to do, but once you did it, all will be
easy. Note I used cabby for this trick, not normal taxi car.

Race Mission(gta3)

If you can't win races just do this: Get a race mission, then get ANY vehicle, drive
to start, when the race begins, get out of it, sprint from it, press ecsape (to save
time), type BANGBANGBANG then press esc again and all cars will be "BOOMED" includin'
other race cars! Then, again get some car and win the race! Easy, isn't it?

Hidden packages (gta3)

Collect 10 hidden packages and the pistol will be spawned to hideout. Collect them
20 and the uzi will be spawned to to hideout. This can save LOTS of money. You can
collect it 2 times. Trick is: pick it up, go to house, and then, when it ask to save
game, say cancel, and pistol is again spawned. You can't repeat this 'cuz the weapon
won't spawn again until you are busted/wasted, and you lose weapons. Then it will
spawn again and you can repeat trick.

How to find Lamar (gta3)

Go to 8-balls garage and pick up lamar and you could drive around with him the whole
game and he hepl you beat up gang members.