Grand Theft Auto 3 cheats and cheat codes for PC

Cheat codes:
During the game play, input the following codes:

Code - Result
Enter "WEAPONSFORALL" as a code - Crazy Peds 
Enter "TURTOISE" as a code - Maximum Armor 
Enter "TIMEFLIESWHENYOU" as a code - Faster Time 
Enter "SKINCANCERFORME" as a code - Clear Weather 
Enter "PEASOUP" as a code - Foggy Weather 
Enter "NOPOLICEPLEASE" as a code - Lower Wanted Level 
Enter "NOBODYLIKESME" as a code - Peds attack you 
Enter "NASTYLIMBSCHEAT" as a code - More Gore 
Enter "MOREPOLICEPLEASE" as a code - Raise Wanted Level 
Enter "MADWEATHER" as a code - Faster Time 
Enter "ITSALLGOINGMAAAD" as a code - Fighter Peds
Enter "ILOVESCOTLAND" as a code - Rainy Weather 
Enter "ILIKESCOTLAND" as a code - Cloudy Weather 
Enter "ILIKEDRESSINGUP" as a code - Change Outfit/Skin 
Enter "IFIWEREARICHMAN" as a code - Additional Money 
Enter "GUNSGUNSGUNS" as a code - Unlock all Weapons 
Enter "GIVEUSATANK" as a code - Tank 
Enter "GESUNDHEIT" as a code - MAximum Health 
Enter "CORNERSLIKEMAD" as a code - Improve Car Handling 
Enter "CHITTYCITTYBB" as a code - Moon Gravity 
Enter "BOOOOORING" as a code - Slow-down the time 
Enter "BANGBANGBANG" as a code - Destroy All Cars 
Enter "ANICESETOFWHEELS" as a code - Invisible Cars With Visible Wheels 

I found a great cheat if your computer struggles, performace wise.
Pick a street any street and move next to a building, then enable 
the "giveusatank" cheat, do it over and over, at least 10 times until 
you have a pile of burning tank's in the middle of the street, now get 
in your car and finish the level without being bothered with all the 
cars, because they are all gone, your computer runs faster and the 
game is more fluid, it's also funny to do something wrong and watch 
your wanted level go up and see all the cops, and FBI men chase you 
on foot waving there guns. Submitted by: slangman

Get own prostitute
To get your own prostitute that you own just get her in your car. 
Then park your car in your garage at the hideout and save the game.
She will now stay there. she is yours until you let her leave.
Submitted by: wizard