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First take out your Lancer and head left or right and jump up and kill the first two Chickenbots. Then go all the way to the left and kill the Chickenbot in the room at the left edge of the level. Do the same to the right edge room. Then drop down the big tunnel and kill the two Chickenbots. Then go left, break the crates and kill the two Chickenbots behind them. Then head left and jump up to the platform right before the big pipe and head right and kill the last two Chickenbots.