I’m in complete agreement with Big Alba’s review above. However, with respect to JarickCWAL, you can buy this game for a buddy. I’m not saying you should buy it for your prepubescent brother so he can feel the joy of simulated murder sprees. No. That would be a bad thing. But feel free to buy it for a friend that you know would really dig the gaming experience.

Here is an extensive list of cheats for Grand Theft Auto 3. Though I’m usually against using cheats to blast through a game’s missions/stages, several of the ones in GTA3 actually add a different and interesting dimension to the gaming experience (especially the 'Liberty City Survivor' cheat).

Grand Theft Auto 3 Cheats

NOTE: P = saving the game with this code in effect will cause it to be permanent.

Full Health: R2, R2, L1, R1, Left, Down, Right, Up, Left, Down, Right, Up

Full Armor: R2, R2, L1, L2, Left, Down, Right, Up, Left, Down, Right, Up

All Weapons: R2, R2, L1, R2, Left, Down, Right, Up, Left, Down, Right, Up

Higher Wanted Level: R2, R2, L1, R2, Left, Right, Left, Right, Left. P

No Wanted Level: R2, R2, L1, R2, Up, Down, Up, Down, Up, Down. P

Gore Mode (because it isn’t bloody enough already):
Square, L1, Circle, Down, L1, R1, Triangle, Right, L1, X. P
Note: No message will confirm this cheat, but it does work. Just try shooting someone to test it.

Rhino Tank: O, O, O, O, O, O, R1, L2, L1, Triangle, O, Triangle.
Note: The tank can only be destroyed by fire (Molotov cocktails or the flame thrower), or plunging into the sea. P until destroyed.

Armed Pedestrians: R2, R1, Triangle, X, L2, L1, Up, Down. P

Liberty City Survivor: Down, Up, Left, Up, X, R1, R2, L2, L1. P
Note: Works great with the Armed Pedestrians code, or else it’s just Fight Club.

There are numerous other cheats, special places, vehicles, and missions in Grand Theft Auto 3, and these can be readily found around the internet. I only wanted to list the codes that would enhance gameplay, not kill it. I emphatically advise you to solve and explore the game to learn all its secrets. It’s just so much more fun that way.
/end public service message.