GTA IV has 14 online multiplayer modes. It doesn't have spit-screen multiplayer and you can't play through the story co-op but there are three co-op missions with cutscenes.
gtaiv-getting-started.pdf 400kB - This is the official GTA IV getting started guide. It lists the controls, tips and tells you to access the multiplayer mode through the in-game phone.
The 14 GTA IV Multiplayer Modes
1. Team Deathmatch (2-8 Teams)
Players work as a team to rub out other teams for money - and the crew with teh most cash at the end of the round wins. Take the other crew down. Remember to loot the cash dropped by deceased players. That's the way to get ahead.
2. Team Mafiya Work (2-8 Teams)
You're a member of a crew doing contract work for the mafiya - including such plum gigs as escorting wanted men, picking up MacGuffins and stealing cars. Work as a team to complete contracts before the time period ends and get the rewards. You'll probably want to do your best to scupper the other crew's work as well. Each contract you complete gives your team cash, and the crew with the most cash at the end of the round wins.
3. Team Car Jack City (2-8 Teams)
Cars spawn parked around the map and the teams must steal them and take them to a drop off point. The cash teams get for dropping off stolen vehicles depends on their condition - teams get less cash the more damaged they are. The exception to this are special bonus cars, stuffed with drugs, which give a set amount of cash on delivery no matter how damaged they are. Your crew has to get hold of whatever vehicles the boss wants. Whichever crew makes the most money
4. Cops n' Crooks (2 teams only)
A team-based mode in which the Crooks must get their Boss to safety, while the Cops have to take dim down. The Boss is marked with a cross hair. This mode has two sub-modes: All for One and One for All.
In All for One, one team is made up of Crooks and a Boss, and the other team is made up of Cops. The Cops are trying to hunt down and kill the Boss while the Crooks are trying to protect him. The cops win by killing the Boss and the Crooks win by getting the Boss safely to the getaway vehicle and escaping.
One for All is similar but there is no Boss. Here, the Cops win by killing all of the Crooks and the Crooks win by filling up a getaway vehicle with members of their team. Only 4 people can escape in the getaway vehicle. Players cannot respawn in this mode.
Both of these variations can be won by the Cops if they manage to destroy the getaway vehicle.
5. Turf War (2 teams only)
A timed capture-the-base mode. There are a number of bases around the map that you have to take by standing on them for a short period of time. The more players that are on a base, the faster it can be captured. The more bases that your team owns, the faster your team's cash score increases. If the rival gang is on or near a base, you won't be able to take control of it - so do what you can to try and... displace them. The team with the most cash at the end of the round wins.
6. Free Mode (1-16 Players)
Free Mode allows for up to 16 players to be online in the full map running amok. Players are free to do whatever they want in this no-rules, no-holds-barred roaming option.
7. Deal Breaker (2-4 Players)
A major deal is going down between the biker gang and the Mafia - and you've been cut out. Head over there with your crew and put the akibosh on it by ripping off both parties. Get hold of the merchandise and get out of dodge. No one can know that Kenny Petrovic was behind this, so your crew must eliminate all witnesses.
8. Hangman's N.O.O.S.E. (2-4 Players)
In this co-op scenario, the authorities have surrounded Francis International Airport to take down Kenny Petrovic. That's where you and your crew come in. Petrovic's contracted you to protect him by any means, and facilitate an escape across town to a safe house before the noose tightens. If Petrovic dies, you all fail.
9. Bomb da Base II (2-4 Players)
This special online co-op mode pays tribute to the beloved 8-Ball mission from Grand Theft Auto III.
A rival export business has a ship sitting in the docks waiting to be loaded. Per contract from Kenny Petrovic, you and your crew must steal the explosives from a convoy, gain access to the ship and plant two bombs. Then get off the ship before she blows.
10. Deathmatch (2-16 Players)
Quite simple: with up to 16 players online, your objective is to have the most kills within the set time. Players are awarded contract money for each kill, and can also loot casualties for their dropped cash. The player with the most cash when the game ends wins.
11. Mafiya Work (2-8 Players)
Doing the Russian Mafiya's dirty work is a cut-throat business. In this mode, at Kenny Petrovic's behest, you'll need to complete a variety of different contracts before your opponents do and reap the rewards in the process. Contracts range from collecting certain cars, taking out victims, picking up prostitutes to blowing up vehicles. Successfully completed contracts earn you cash - and the player with the most cash at the end wins.
12. Car Jack City (4-16 Players)
Steal whatever car the boss wants. The amount you get paid per vehicle will depend on the condition they're in when delivered to the destination point. However, there are also bonus vehicles on the boss' wish list that happen to contain narcotic contraband - he will let you know if one of these comes up, and it will be marked in green on the map. The extra cargo of these cars outweights the significance of the damage, so just get them back to the boss any way you can. Whoever earns the most money at the end wins.
13. Race (1-16 Players)
Race to the finish through each checkpoint in order. If you take a wrong turn or mess up in some way, you can respawn your vehicle on the last checkpoint you passed. There is a large selection of races for cars, boats, and helicopters - you can choose laps and vehicle class/type. This mode has two sub-modes: Free Race and Cannonball Run.
Free Race are point-to-point races. First one to reach the end point wins.
Cannonball Run are races where you have to traverse several checkpoints any way you can.
14. GTA Race (1-16 Players)
Similar to the orthodox Race, but with the added element of combat. Race and fight your way through the checkpoints in order and then hit the finish, but this time you can also pick up the weapons spawned en route to help take out your opponents. You can also excit the vehicle during the road races.
This isn't actually a multiplayer gameplay type, it's just a way to play the multiplayer modes with your friends.
Players can choose to engage in an 8-player Party Mode wherein a Host can at any point select from a range of the other different game modes and then all players in the party will switch over to that newly selected mode of play. This is an easy way to corrall all your friends and keep them together for a series of multiplayer gameplay modes. For convenience, players are intially spawned next to cool vehicles, helicopters or weapons - so that they can get right into some action.