# Extra armor
While playing the game, press L(2), R, B(2), A(2), R.
# Extra health and armor
While playing the game, press L(2), R, A(2), B(2), R. Note: Enabling this code while in a vehicle will also repair all of its damage.
# Weapon tier 1
While playing the game, press R, Up, B, Down, Left, R, B, Right.
# Weapon tier 2
While playing the game, press R, Up, A, Down, Left, R, A, Right.
# Weapon tier 3
While playing the game, press R, Up, Y, Down, Left, R, Y, Right.
# Weapon tier 4
While playing the game, press R, Up, X, Down, Left, R, X, Right.
# Explosive Eagle ammunition
While playing the game, press L, R, X, Y, A, B, Up, Down.
# Increase wanted level
While playing the game, press L(2), R, Y(2), X(2), R.
# Decrease wanted level
While playing the game, press R, X(2), Y(2), R, L(2).
# Sunny weather
While playing the game, press Up, Down, Left, Right, A, B, L, R.
# Extra sunny weather
While playing the game, press Up, Down, Left, Right, B, X, L, R.
# Cloudy weather
While playing the game, press Up, Down, Left, Right, X, Y, L, R.
# Rainy weather
While playing the game, press Up, Down, Left, Right, Y, A, L, R.
# Thunderstorm weather
While playing the game, press Up, Down, Left, Right, A, X, R, L.
# Hurricane weather
While playing the game, press Up, Down, Left, Right, B, Y, R, L.
# Foggy weather
While playing the game, press Up, Down, Left, Right, Y, B, R, L.
# Better body armor
Successfully complete all five Vigilante mission levels with a 100% kill rate.
# Infinite sprint
Successfully complete all five Paramedic mission levels.
# Immunity to fire
Successfully complete the Firefighter missions with a "Gold" rank.
# Quickly extinguish yourself
When you are on fire (for example, after touching a flaming car), blow into the microphone to almost instantly extinguish yourself. It usually takes about two tries.
# Super acceleration
While at 0 mph, hold A + Y. Release Y, and your wheels will burnout and you will go fast.
# Go-Kart
Go to the bottom right corner of the first island (where Mikhail Faustin's house is in GTA 4). Go all the way down to the bottom until reaching the last house, then go three houses to the right. Go into the back garden to find a Go-Kart. Note: If it does not appear, go to the front door, and return and it will appear if you are at the correct house.
# Easily complete "Store Wars"
To easily complete this mission, first get a police car, and log onto the police computer. Search for an arson crime (fire making criminals). Do the Vigilante mission as usual, but when you kill the criminals, pick up the flame-throwers. Start the "Store Wars" mission, and quickly park two cars at each end so it makes it difficult for the vans to get past. Let the vans drive towards you (or you go towards them). Equip the flame thrower, and hold A for approximately two seconds. The vans will explode very quickly.
# Trophies
Successfully complete the indicated task to unlock the corresponding trophy at your apartment:
Diamond Pillbox: Deal 30 downers.
Gold Medal: Get a score of at least 10,000 for a weapon.
Golden Binoculars: Discover 40 drug dealers.
Jeweled Bong: Deal 30 weed.
Platinum Syringe: Purchase 5 heroin.
Silver Safe: Gain a $2,000 drug profit.
Wooden Spoon: Incur a $500 drug loss.