Grand Theft Auto 3 has a lot of secrets in the game. This section will tell you of some secrets.

Banshee in Portland:
Starting off, there is a good sportscar in Portland. It is located in St. Marks, near 8-ball's bomb shop is. It is in the middle of AAMCO, a gas station, and where 8-ball's. Go inside the car shop and take one of the cars and crash it through the tinted windows. A banshee is in there.

Buggy in Portland:
After you finish Bomb da Base, Salvatore's last mission, and if you go into the apartment grounds in Hepburn Heights at 18:00 and 24:00 there is a Buggy which looks like the one Joey works on.

Hooker Cheat:
When you want more health just go up to a hooker (the skimpy lookin hoes) in a car and she will walk up to you and seem to talk to you. After a while she will get in. Go to a hidden area and your health will shoot up for a while. This costs money though but after you leave you can just kill her to get your money back! Also you can't be in any police car, taxi car, ambulance, or fire truck.

Vehicle Missions:
The vehicles missions are taxi, police, fire truck, and ambulance missions. They are good for extra cash and hidden stuff. Do 100 taxi missions to get a better faster taxi called a Borgnine Taxi found in the parking lot of HEAD Radio station in Portland. 20 Fire Truck missions in each island gets you a flame thrower at your hideout. 10 police missions in 1 island is one bribe delivered to your hideout. Do 20 in each island and thats six bribes in your hideout. Convienent. However, Ambulance has a variety of rewards, going to lv12 in it gets you infinite running, doing 50 missions gets you hearts delivered to your hideout, doing 100 gets you adreneline pills. Note:People don't trust a messed up taxi, don't damage it too much otherwise people won't get in and you will have to end it. Also doing Fire Truck and Police missions help you find rare vehicles. Killing criminals also helps your arsenal.