But you realize that doing this was retardeda mistake, and want the tile flat again. You ''could'' just dig up the extra 5 dirt from corner 3 again and drop them on corner 1 and it would be taken care of, but instead of that you position yourself on the tile and select "flatten".
==== How it works ====
* When flattening cave floors, you have to stand on the tile you are flattening. You cannot flatten from adjacent tiles.
* The flattening option will not raise corners in caves. It will mine down all corners to match the lowest one. (Needs confirmation)Confirmed: The corners are lowered.