Terrain Destruction Therapy

You are a dwarf and you're digging a hole! For some reason my friends considered this game therapeutic so I named it "Terrain Destruction Therapy," so go around the infinitely generating map with a variety of tools and build complex cave systems, or just make a slide and ragdoll down to the floor. I had a desire to make this when I saw Red Faction 1's terrain destruction and wanted so badly to do that in a more free and endless way.