To unlock the Crossbow in Cold War Zombies, players must kill 50 special enemies with a double Pack-A-Punched special weapon. In most cases, as players probably don't have the Ballistic Knife yet, they'll be using the M79 or 'Thumper," as old-school COD players prefer to call it. Special enemies include Mimics, Tempests, Megatons, Manglers, and ...