Library, made possible
Everyone has been telling me library is the hardest level, and I think so too.
It can become easier though if you make a few adjustments.
First, always have a shotgun for close range, the flood do not easily die by rapid faring guns.
Have a pistol or rocket launcher for long range. The flood are HORRIBLE long rang so you can take them out before they get to you.
Kill the people that pop far away or they will act as a genade placed next to you.
Be carefull too because the only way you can tell they are coming is by radar or sight, they will not warn you by firing at you (obviously because they don't have guns).
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