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Overkill Achievment

This is for the Overkill achievement, should only take about 20 seconds with fast foward on. I found that most Overkill levels cause your frames to drop pretty hard and you have to restart them once and awhile, so I experimented a bit and found this to be the most effective method. This level kills 550 humans per 5 seconds so netting you 10,500 kills in 20 seconds in one go. Hope this helps.