If I was apprehensive about anything in Halo 3, it was the Flood. Halo 1 has reached a certain legendary status amongst fans, but even it has a sore spot for many: the Library, where you navigate endless repeating dark corridors with endless hordes only four enemies to fight: Human Flood combat forms, Elite Flood combat forms, Carrier forms and Infection forms. The level goes on a floor or two longer than it really has to, and only has a few tricks up its sleeve to make it seem fresh.