Making Crysis is hard. So hard that the devs don't have time for petty things like co-op multiplay. The game's senior designer Bernd Diemer says that modders will have to add that. The game's getting so complex and pretty that the devs have been fine-tunning the AI — For example, enemies attack and move in groups. Pretty pictures are swell, but co-op out of the box would've been nice. Brian Ashcraft

Crysis Dev Talks [Eurogamer]

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