what the?

You and your friends are playing a video game when suddenly you hear a series of screams and shouts. Curious, you peer out of your home and see a horific sight. People are attacking others, blood drips from corpses and commoners scramble around to escape the mad ones. You quickly come to the conclusion, Zombies. In a frantic rush you grab whatever weapons you can find and distibute them amongst yourselves and head out in search of your neighbors and loved ones in the unfolding chaos outside...