So if you want to lower a tile stand in the corner of the tile activate your shovel, right click>Dig this will lower the corner you are standing on. To lower the whole tile, you must stand in each of the four corners in turn and dig. This is the same for raising a tile, just drop dirt instead of dig.
When you think you have a tile nearly flat you can find out if it is perfectly flat by right clicking>flatten. If You will then get the timer that tells you how long time there is left to perform the task starts at 0:09 seconds then it message 'The ground is flat. If it doesnhere't start at this time right click again and select stop. Then you should dig where u need to flatten in the tileevent window.
A better way to check the flatness of an edge of the tile is to press 'c' key, then look at one tile and if the line is straight, then you are sure it is flat.
If you want to dig for a rock tile you must be aware that you probably have to dig a lot of dirt. To start you must dig a reasonable distance above water, keep digging in one corner till you "hit rock" or you do not have enough skill to dig deeper. Once you hit rock in one corner you must then dig until you hit rock in the other corners of the tile. When you hit rock in all four corners the rock tile will be uncovered.
'''Flattening has been revamped. The information below is mostly outdated and no longer correct'''
==Flattening Guide==
To make a patch of ground perfectly flat is an art, and requires patience. Below is a guide on how to flatten one tile.