Grand Theft Auto IV/Vigilante

From GameWiki

Vigilante

These side missions are required to get 100% in GTA4. By completing all of these missions, you will get another 2.50% closer to finishing the game.

You can start doing these after the "Crime and Punishment" mission.

In earlier games you had to do them in one long string. Not anymore. All you have to do is complete 20 challenges in total. You can take a break, restock weapons and armor, even save in between whenever you want, as long as you have not accepted a mission yet. I would recommend to have a full ammo bag of SMG ammo with you and be at full health and armor when doing these. It will help you a lot.

Now go and find a cop car. You can find some parked at certain locations in the city and of course, there are some cruising around. The parked ones are the easiest unless you try to steal one from in front of a police station. Or, you can just run up to a occupied car, push it, kill the cops that get out of it, get the car, and then lose your wanted level, but that is kind of risky and cold-hearted. Or, you can also dial 911 on your phone and request an officer to your location. When the car arrives, the passenger will get out and start looking around and the driver will stay in the car. At this point, the driver's door is unlocked, so you can jack the car from the remaining officer and drive it away. You'll only get one Wanted Level Star in doing this, unless you run one of the officers over driving the car away.

Make sure you have no wanted rating then stop the car. Press the button to access the police computer. Select view current crimes. Now select one of the three random generated crimes. It can be a stolen car, which is a car full of criminals that shoot at you when you come close. You have to kill them or destroy the car to finish this one. Gang Activity means a group of four guys mostly you have to kill in some back alley. Criminal on foot is a single guy running away on foot, which is relatively easy to find. The last two are definitely the easier ones.

Once you selected one, you get a red marker of where your target is and a timer. You have that amount of time to get to your target. The timer only is for getting close. Once you are close to where you have to be, the timer goes away and you can do the mission until you are done or dead. With the mission over, you will lose any wanted level you might have gained (as long as you did not shoot any cops).

If your car blows up, just go grab a new one. You can also select from the police computer "Call Police Backup" and a new car will arrive.

When taking on single people, try to run them over first, that usually kills them straight off or at least knocks them down. Now you can easily get out of the car and kill him.

Gangs are groups. Try to come at them from cover, like around the corner or from above. Also use grenades to throw into their midst. You will kill a lot and at least hurt a bunch as well. In the higher levels they start to use them too, so be careful.

The cars are the most annoying ones. Try to avoid them. If you can’t, drive into them, and shoot at the driver first. You can also be a bit behind and just shoot at the car in general until it catches fire.