OK SO APPARENTLY THIS IS THE RULES FOR UNLOCKING THE SECRET

THERE ARE 40 MANNEQUINS WITHIN THE ENTIRE MAP(SOME ARE JUST OUTSIDE IN OTHER BACKYARDS ECT..)
ALL HEADS NEED TO BE BLOWN OFF IN ONLY 30 SECONDS
MUST BE THE FIRST 30 SECONDS OF THE MATCH.
MANNEQUINS SPAWN IN DIFFERENT LOCATIONS EACH GAME MAKING IT IMPOSSIBLE TO MAP THEIR LOCATIONS.
IF U DONT MAKE IT IN TIME SOME HEADS WILL GROW BACK

if done correctly and in 30 seconds or less the sun will go dwn to dusk and the mannequins will mutat into zombies. im unsure if the game becomkes some sort of last man standing match or if the regular gamemode still plays out. all i know is that its freakin hard especially since every game they are in new locations
i am also not sure if just one person has to accomplish this or if a party of people can work together to do it..