How about an escape to cade map! Where you start off with no guns but half to get to the buy zone first and then to where you are going to cade. Also you should make it so that users who fail some of the stuff are teleported to spawn so that they can just end up being zombies. After like 15 seconds the map changes the first part via a door or something that makes a different rout to get to the cade area. This will make it so zomibes do not need to get though the obsticals and so that they can still be slowed down enough to give players time to get to cade spots. It also makes it so that anyone that fails after 15 seconds or zteles will be a zombie almost for sure. Forced alternative route is an idea I would really like to see used in more escape maps so that you can have more zombies at the end but have them almost all at once when the few survivors have got to the safe zone.