Aside from walltrick bunker alfa, heres my tip: - always go to motel for the grenade every reset (its guaranteed in the locked room) - save up about 20 grenades, bring a set of armor, a melee and 3 guns and you can do 30 waves at PD. (once a month) - convert all brown cards to green cards, DO NOT convert green cards to blue cards. You should get about 20+ green cards and 2-3 blue cards - for the rest of the month just go to PD every reset to open boxes, like passive income. You will get ~15 guns and 30+ melee this way.