I thnk this games needs a map with like a maze where you have to find something or kill all the zombie like this , so you walk around alone while zombies spawn at places.
I like The newer version of this game called Bowmaster winter storm it way better then this one in my opinion just got to his website and there a link to the beta.
 "Homerun In Berzerk Land: Berzerk Ball"){kind=icon}
 "Rage 3"){kind=icon}
 "Zombies! Apocalypse - MMO Zombies Massacre"){kind=icon}
 "BowMaster"){kind=icon}