While I like what I've seen of the map, it isn't playable.

My one time through found a HUGE bug - we get to a safehouse at one point (after going through a jail) and it jumped BACK to a previous leg of the map and there were hardly any zombies, even on advanced. I ran most of the way through and only saw about 5. So it's broke.

Also - i never saw a school. Maybe that's in the later maps you can't reach?