Panzer Demon
When you reach Mission 19 have Edward fire on Max the lead Panzer Demon so that he runs away. When you then kill everyone in Mission 21 except for Max you will have an over-powered Panzer Demon on your side which is the only character that can use the anti-tank rifle without a weight penalty.
More tricks, tips and cheats for this game are right here - Operation Darkness cheats
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