Basically, what you aim for in hard mode, Siberia, is to not get hit even once until you reach the checkpoint. By the time you reach the top of the dam, have one of the characters go to where the portal is going to spawn and use the turret there, and have the other use the first turret. It took my friend and myself a couple of hours to get the level finished, but we're well on our way through hard mode. Good luck.
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