From the title screen, enter the New Game option, then rename your character any of the following names to activate these cheats:
All Weapons: GROOVY
9,999,990 Points: WEYHEY
Show Coordinates: BLOWME
Wanted Level Maximum: EATTHIS
No Police: CHUFF
All Cities Are Open: CAPRICE
All Cities and Weapons Are Open: MADEMAN
All Cities, InŽnite Weapons, and 99 Lives: BSTARD
Liberty City, Part 1 and 2: FECK
San Andreas, Part 1 and 2: TVTAN
Bryan Schmidt
Glendora, GA