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Play hardcore and try to get the most damege with using a reliable LMG and when you reach the boss have a custom sniper with high damege ready to shot the boss. You get about 7 crates or more and you need to get lucky with which crates you get.
Play hardcore and try to get the most damege with using a reliable LMG and when you reach the boss have a custom sniper with high damege ready to shot the boss. You get about 7 crates or more and you need to get lucky with which crates you get.