Unlock the following vehicles at the Boabo auto dealer by performing the corresponding tasks:
VEHICLE - HOW TO UNLOCK 500 XLR8 - Get a Bronze or better medal in all Algonquin races. Banshee - Beat the "Weapons Of Mass Destruction" mission. Bulldozer - Beat the "Counterfeit Gangster" mission. Cityscape - Get a Bronze or better medal in all time trials. Cognoscetti - Beat the "Grave Situation" mission. Comet - Beat the "Jackin Chan" mission. Coquette - Beat the "Raw Deal" mission. Formula R - Get a Bronze or better medal in all street races. Go-Kart - Get a Bronze or better medal in all Go-Kart time trials. Hearse - Beat the "Wheelman" mission. Hellenbach - Beat the "Bomb Disposal" mission. Infernus - Beat the "Cash & Burn" mission. Limo - Beat all of Guy's missions. MK GT9 - Get a Bronze or better medal in all Broker and Dukes races. NRG 900 - Beat the "Wheelman" mission. Patriot - Beat the "Wheelman" mission. Resolution X - Beat the "Pimp His Ride" mission. Rhino - Beat all story missions. Sabre GT - Beat the "Operation Northwood" mission. Style SR - Get a Bronze or better medal in all Bohan races.
There is a Wet Ski mini-game called "Wetscapade" hidden beside a small dock between Lancet and Colony Island. Find the drug dealer near the water's edge in Lancet. From his position, start walking towards the water, and you will practically fall onto the vehicle.
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.
Activate the following cheats by entering the corresponding codes during gameplay and while outside of a safehouse. Note: Enabling codes disables the autosave feature.
CHEAT FUNCTION - CHEAT CODE Extra armor - L(2), R, X(2), CIRCLE(2), R. Extra health and armor - L(2), R, CIRCLE(2), X(2), R. Note - Enabling this code while in a vehicle will also repair all of its damage. Weapon tier 1 - R, UP, X, DOWN, LEFT, R, X, RIGHT to unlock the minigun, nightstick, Desert Eagle pistol, stubby assault rifle, mini SMG, stubby shotgun, and grenades. Weapon tier 2 - R, UP, CIRCLE, DOWN, LEFT, R, CIRCLE, RIGHT to unlock the mini flamethrower, taser, dual Desert Eagle pistols, assault rifle, SMG, double barrel shotgun, and Molotov cocktails. Weapon tier 3 - R, UP, SQUARE, DOWN, LEFT, R, SQUARE, RIGHT to unlock the big flamethrower, chainsaw, revolver, assault rifle, SMG, double barrel shotgun, and proximity mines. Weapon tier 4 - R, UP, TRIANGLE, DOWN, LEFT, R, TRIANGLE, RIGHT to unlock the rocket launcher, stubby assault rifle, baseball bat, Desert Eagle pistol, mini SMG, stubby shotgun, and flashbang grenades. Explosive pistol rounds - L, R, TRIANGLE, SQUARE, CIRCLE, X, UP, DOWN. Repeat the code to disable its effect. Increase wanted level - L(2), R, SQUARE(2), TRIANGLE(2), R. Decrease wanted level - R, TRIANGLE(2), SQUARE(2), R, L(2). Note - This code only decreases the wanted level by one star and must be repeated until it is completely removed. Sunny weather - UP, DOWN, LEFT, RIGHT, CIRCLE, X, L, R. Very sunny weather - UP, DOWN, LEFT, RIGHT, X, TRIANGLE, L, R. Cloudy weather - UP, DOWN, LEFT, RIGHT, TRIANGLE, SQUARE, L, R. Rainy weather - UP, DOWN, LEFT, RIGHT, SQUARE, CIRCLE, L, R. Thunderstorm weather - UP, DOWN, LEFT, RIGHT, CIRCLE, TRIANGLE, R, L. Hurricane weather - UP, DOWN, LEFT, RIGHT, X, SQUARE, R, L. Foggy weather - UP, DOWN, LEFT, RIGHT, SQUARE, X, R, L.
Unlock the following bonuses by performing the corresponding tasks:
BONUS - HOW TO UNLOCK Regenerating health - Complete both noodle delivery missions with a "Gold" rank. Better body armor - Complete all five Vigilante mission levels with a 100% kill rate. Immunity to fire - Complete the Firefighter missions with a "Gold" rank. Ammu-nation store discount - Earn Gold medals on all weapons at the gun club. Upgraded delivery bag - Complete both mail courier missions with a "Gold" rank. Infinite sprint - Complete all five Paramedic missions with 100% lives saved. Bulletproof taxis - Drop off fifteen consecutive passengers without the timer running out. Then, all taxis that you enter will be bulletproof. Gold medal for weapons - Get a score of 10,000 or more for a weapon to get a Gold medal for it.
As you approach a toll booth on a bridge, exit your car. If done correctly, your car will glide through the booth. You can then get back in the car without paying the toll and not getting a wanted level.
Unlock the following trophies at your apartment by performing the corresponding tasks:
TROPHY - HOW TO UNLOCK 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. Jeweled Key To The City - Own all 21 safehouses. Platinum Syringe - Purchase 5 heroin. Silver Safe - Gain a $2,000 drug profit. Titanium Briefcase - Discover all 80 drug dealers. Wooden Spoon - Incur a $500 drug loss.
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.