Crysis Warhead isn't a sequel. You play a different character whose story runs parallel to that of Nomad in Crysis. The look and feel matches that of the original game, but the storyline is much shorter. You can easily beat the game in one or two days. Crysis Warhead was touted as being much more optimized than Crysis. Minimum system requirements read as a P4 2.8GHz, 1GB ram, and a 9800Pro (yes, thats right, the ATI 9800Pro from about 5 years ago). Well, I can tell you that I haven't tried it on my old computer, but on my current computer (C2D 2.4GHz, 2GB ram, and an 8600GT, I still can't play the game smoothly on Medium (it lags in large open areas and for weather effects). Worth playing through once, like the original Crysis, but definitely doesn't have much replay value. The final boss battle is a joke, and when the credits starting rolling, I couldn't believe that was the end of the game. Multiplayer if it is anything like the original will be disappointment.