Originally posted by jonnin:

to learn to do it, you can place floor tiles and flatten to match them. The hoe and cultivator and pickaxe are all useful for this. It takes a while to learn the tools, the bands produced (rings?) by the hoe tool indicate the level but its hard to describe how those work... see a video?

Im fairly far in to the game, but i just cant seem to ge it flatten ill give it a try though