First you have to make sure you have a network ID, this is simple to get in the first menu when u turn on the game. Then click multiplayer when u see the menu with spec ops, campaign and multiplayer. Then click the first one. When it asks for the network ID just simply fill it in then ur in!
There are couple of ways to learn if you're not experienced at COD MP gaming.
First up, if you can get through the Campaign on Veteran, you're pretty close to the skill level required to survive online.
After that, you can start in the Combat Training mode, which lets you play with full XP reward up to Rank 10. The difference is you're playing with a mix of 3 bots and human players.
You can also play by yourself in a Local game against the game bots on Veteran difficulty. If you can hang with the Veteran bots, you'll do okay on regular MP.
The bots are based on actual Treyarch developer gaming styles, and it's scary sometimes at how human they seem. Knifing, quick-scoping, virtually everything you'd expect in a regular game is included.
u cant
Yes, there is online multiplayer on Call of Duty 4: Modern Warfare.
Unfortunately no, you can't play multiplayer on Call of Duty Modern Warfare 1 or on Call of Duty Modern Warfare 2 on the same screen. But on Call of Duty Modern Warfare 3 and Call of Duty Modern Warfare Black Ops you can play multiplayer on the same screen. There is an new Call of Duty Black Ops 2 coming out soon though, so I expect that to also have that feature, since its newer.
Call of Duty World at War, Modern Warfare, Modern Warfare 2, Black Ops, and Modern Warfare 3 all have online multiplayer.
U go to multiplayer if no multiplayer u beat
Yes You Can
no, but there is call of duty reflex, a remake of CoD4 with multiplayer.
no , but call of duty modern warfare reflex (cod4) has
No you can't.
Sadly no.
No. There is only Nintendo WFC.
Multiplayer is free.
There are a total of 70 levels (ranks) in Modern Warfare 2 Multiplayer.