thanks for answering guys....i normaly play with 3or4 players.about GUNs i cant complaint, who having a thunder gun and ray gun+monkeys:p:p..last time we played for around 7 hours and got2 level 32..i personally feel thats a long time for just round 32..also i feel we die more to fatige of playing the game sooo long.thats why i want 2speed up killing zombies.oh yes and head shots no promble were pretty good doing that.....Does any 1 how many zombies come out per level??i know solo is 24 at a time...