Viranth they are two separate games. You don't need to the original Crysis to play Crysis Warhead. Also the multiplayer is separate from Crysis.
Makes sense to me but some reviews hark on making WH multiplayer separate. Don't know how they would combine them since WH has new maps, weapons, game mode, etc.. Hopefully picking up WH today! With no new BF game this fall, WH will have to do for now.
Perpetual debt is slavery.