Can anyone explain the difference between Crysis, and Crysis: Warhead?

Hello, I am looking into purchasing Crysis, but I find myself confused in all the different versions of the game.



Does Crysis have multiplayer?



Does Crysis Warhead have multiplayer?



What is Crysis Wars?



PLEASE HELP. THANKS IN ADVANCE.Can anyone explain the difference between Crysis, and Crysis: Warhead?
Crysis has multiplayer. Quite basic though - works the same as Battlefield 2's.

Warhead has Crysis Wars with it, which is a more developed indepth version of the Crysis multiplayer.



Hope this Helps :)Can anyone explain the difference between Crysis, and Crysis: Warhead?
http://www.ea.com/crysis/home.jsp