What are the numbers for?
The numbers on the Nest Egg map are my first attempt at a way to randomly determine a location in the house (numbers along the bottom to determine which floor, the numbers on the rooms to determine the room on that floor). This is for a cthonian that is not under Keeper control (at least initially).
Another thing I didn't like in the game is how the cthonians moved. In an attempt to have them move more realistically, the cthonian tunnels up through the floor into a room, does whatever it is doing ("Cup of tea and a slice of cake Aunt Sally?") then descends back into its burrow. This causes damage to the building (placing rubble markers which restrict movement). If they 'attack' a room on an upper floor they smash thru all the rooms on the floors below (which means they can also be attacked from multiple locations). Having the numbers and the floors aligned as they are helps to determine which room(s) it passes through if this happens.