I don't get the point of even having the boxes if you can just grenade jump out, that defeats the entire point of boxing people in in the first place and completely kills the suspense thing...
yeah i agree with who ever said you should put roofs on the cubicles... unless the point is that zombies can jump in and out or decide to teleport around the map
Did you use any interlocking or ghost merging? It looks like you were in a hurry so you just made this map. I'll give it a 4/10.