All pedestrians, cars, Portland, Staunton Island, and Shoreside Vale unlocked in Multiplayer mode

While playing the game, press Up(3), Triangle(2), Circle, L1, R1. If you entered the code correctly, a message will appear.

Fourteen pedestrians, Portland, two gangs unlocked in Multiplayer mode

While playing the game, press Up(3), Square(2), Triangle, R1, L1. If you entered the code correctly, a message will appear.

Twenty eight pedestrians, Portland, Staunton Island, four gangs unlocked in Multiplayer mode

While playing the game, press Up(3), Circle(2), X, L1, R1. If you entered the code correctly, a message will appear.

Forty three pedestrians, two locations, seven gangs unlocked in Multiplayer mode

While playing the game, press Up(3), X(2), Square, R1, L1. If you entered the code correctly, a message will appear.

Weapons (tier 1)

While playing the game, press Up, Square(2), Down, Left, Square(2), Right. If you entered the code correctly, a message will appear. The brass knuckles, knife, Molotov cocktails, 9mm handgun, shotgun, Tec-9, AK-47, flamethrower, and sniper rifle will be unlocked. To get infinite ammunition for this or the other weapons tiers, repeatedly enable the code until no ammunition number appears beneath the gun pictures. Note: Enabling this code will cause your street creds to substantially drop in points. You can check your creds in the stats menu at the pause screen.

Weapons (tier 2)

While playing the game, press Up, Circle(2), Down, Left, Circle(2), Right. If you entered the code correctly, a message will appear. The katana sword, grenades, revolver, sawn-off shotgun, Uzi, M16, rocket launcher, and laser scoped sniper rifle will be unlocked. To get infinite ammunition for this or the other weapons tiers, repeatedly enable the code until no ammunition number appears beneath the gun pictures. Note: Enabling this code will cause your street creds to substantially drop in points. You can check your creds in the stats menu at the pause screen.

Weapons (tier 3)

While playing the game, press Up, X(2), Down, Left, X(2), Right. If you entered the code correctly, a message will appear. The chainsaw, grenades, revolver, SMG, combat shotgun, mini-gun, and sniper rifle will be unlocked. To get infinite ammunition for this or the other weapons tiers, repeatedly enable the code until no ammunition number appears beneath the gun pictures. Note: Enabling this code will cause your street creds to substantially drop in points. You can check your creds in the stats menu at the pause screen.

Full health

While playing the game, press L1, R1, X, L1, R1, Square, L1, R1. If you entered the code correctly, a message will appear. Note: You must enter this code multiple times to increase your total money. If this code is enabled when your car is smoking or damaged it will get repaired.