WICKED game but in the dark you need luminating lamps or something and to all peoples who connection is bad mines fine. if your connection is fine + to keep this comment alive!!!!
For getting the achivement select "nightmare" difficulty, object collision, friendly fire and devils "off", select "Boxy" map, block one of the entries with "fake walls" and then kill everything with "rocket luncher". At the end of every level get everything zombies have left off, sure you'll recharge your rockets. Sure "win". Press "+" for keeping this comment "alive
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