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Added "How digging affects multiple tiles" and "Terraces"
=== Single Tile Digging ===
http://img196.imageshack.us/img196/8773/diggingbase.gif This is 1 tile, divided into 4 sections. You will only see 1 tile, so you need to visualize that it has 4 squares inside of it. You are the "X" standing in the corner of section square 4.
http://img510.imageshack.us/img510/9041/diggingex1.th.gif When you inspect the 4 borders, you will see, "Level", "Away" or "Towards" along with the number of "dirts".
Therefore you need to dump 2 dirts in square 1, and 3 dirts in square 2, for the tile to be level with square 4.
=== How digging affects multiple tiles ===
Congratulations, you've leveled a tile! Oh oh, now the previous tile, which was already level, has a slope! What happened?
For small changes in land height, it can be hard to notice if one tile is slightly higher then the next. The land is usually sloping over many tiles.
http://img442.imageshack.us/img442/8931/multipletiles.gif
This image shows 3 tiles side by side. In example '''A''', left to right, we have a tile that needs to be flattened, and two tiles that are already flat.
The arrows represent the dirt we are going to dig, and drop to flatten the tile.
In example '''B''' we see that although we have flattened the first tile, now the second tile has a slight raise! This is because we are dealing not only with individual tile flatness, but also terrain flatness. To remedy this, as the arrows show, we would have to lower the whole first tile by digging 1 dirt out of each square to match the other two tiles.
=== Terraces ===
Using what you've learned, you can now shape the land into terraces. Think of some [http://rst.gsfc.nasa.gov/Sect6/ida-china-pho-environment.jpg oriental hillsides.] Doing this on a mountain side is pretty extreme, and beyond the scope of this tutorial. Doing this on small gentle hills is useful so that you don't end up with a large flat spot, followed by a very steep hill! Example '''B''' above is what we are aiming for. We want a flat tile, followed by an angled tile, followed again by a flat tile. This will allow the land to follow a gentle hill, while maintaining useful land!
