play on the map tight2. disable devils. kill until you get rapidfire for shotgun. block one of the entrances at the top stand in front of the other one with your shotgun. blast away. takes a while
if you click on things a couple times, they disappear. get rid of all but one of the collectors in level 11 and keep only one wall. stick the collector and the wall to a corner, and be very patient
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 "Generic Defense Game")
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 "Speck Oppression")
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