ID:167155
 
http://developer.byond.com/hub/CaptFalcon33035/MapSaving

This is map saver, it saves turf and obj.
How to make it save only on one z? Like only on z:5 ?
There's a simple for() loop used for all of the turfs. Thus, adjust it.
Most people don't like the update so I am planning on degrading it. It will support map saving on only one z level as well. You could use block() for now and cycle through the movable atoms and save them in each turf in the block.

Or, you could just cycle through all the atoms in the world and if they're z variable is 5, save them.