"Black Ops 2 Zombies" Buried Double Your Perks For Free Trick Double your Perk Drop for free trick on Buried To Double your Perks for Free on Buried You will need a time machine and that's pretty much it.br br Head through the mansion when you have the last ghost place your time machine and kill her.br br Before you collect it travel back in time collect itbr br Then kill here again for another perkbr br Easy br br Please Hit The Like Buttonbr And Subscribe So You Can Keep Up To Date br Or Leave A Comment Below We Always Reply ....