yes i know one. what you need is 3-4 players. buy any 2 guns off the wall then you and a friend down yourselves. then wenyou are being revived, hold down the revive button. so when ur standing up your automatically reviving your friend. once hes revived buy any gun off wall and bam! 3 guns! then you can do the box and trade any weapon from that for the off wall guns. i do it every game, extremely fun!!!