Is There a Zombie Cheat in GTA: Vice City Stories (PSP)? No.

No. There is no zombie cheat, mode, or unlock in Grand Theft Auto: Vice City Stories on PSP (or PS2).

Why This Rumor Exists

• Confusion with GTA: San Andreas PC mods: "Zombie Andreas," "SA:MP zombie servers," or the "Zombie Alarm" cheat code myth.
• Confusion with Red Dead Redemption: Undead Nightmare (2010): Standalone zombie DLC.
• Cheat Code Lists: Many fake code lists online invent "zombie mode" codes for every GTA.

Actual PSP Cheats (Vice City Stories)

Enter via button combinations during gameplay (no pause menu):

• Full Health/Armor: ↑, ↓, ←, →, L, R, L, R
• Weapons Tier 1/2/3: Specific combos (L1, R1, Square, etc.)
• Lower/Reset Wanted Level: R, R, L, L, ←, →, ←, →
• Spawn Vehicles: Rhino, Quad, Hotring Racer, etc.
• Weather/Time: Sunny, Cloudy, Rain, Night.

Full list: GTABase / IGN

Zombie Content on PSP

• Resident Evil Origins Collection (RE1, RE0, RE4)
• Dead Head Fred (undead protagonist)
• Valkyrie Profile: Lenneth (undead themes)
• Homebrew: Half-Life: Echoes, Quake ports with zombie mods (requires CFW).

No zombies in Vice City Stories. Enjoy the 1984 Miami vibe, empire building, and Phil Collins.