Not the game itself, and its free on Playstation network, but you need an internet connection and a Xbox Live Gold subscription.
It only costs money to buy it it doesnt cost any money what so ever after that unless your buying extensoins(none out yet)
no, i think its is for free, but if you buy the game you need to be careful because one scrath can ruin your desk and the internet on the pc is really laggy
Once you have the game it's free to play for ever, although if you want to have your own server you may have to pay for that.
No, it is free to play online.
Yes, there is online multiplayer on Call of Duty 4: Modern Warfare.
Call of Duty World at War, Modern Warfare, Modern Warfare 2, Black Ops, and Modern Warfare 3 all have online multiplayer.
yes
Modern Warfare 2 is a better game if you are going to play online.
No
yes
No there is no cheats but there is glitches
well call of duty and modern warfare are the same it is called Call of Duty: Modern warfare and then came call of duty: modern warfare 2
Call of Duty 4: Modern Warfare came out first. This is the first game in the Modern Warfare series, and Modern Warfare 3 is the third game in the Modern Warfare series.
Multiplayer is free.
Sadly, you cannot get gamer score points in CoD: 4 Modern Warfare Multiplayer.