How to Tunnel: As mentioned, you select 'Tunnel' from the options available in the mining menu and click an exposed face of a cliff (or your own pit mine for some Dwarfyesque fun ;P ) and you'll get the 'Entrance.' After this, you'll see some boxes (again as mentioned before) along the sides of the walls of the tunnel. Double(?) clicking them extends your tunnel in that direction. But here's something I have NOT seen mentioned. You can delete individual areas and tiles, as well as add stairs! Click the 'sword' icon in the mining window and select one of the top three check boxes for your tunnel, each allows you to edit it in different ways. From the left: Extend -> Delete -> Stairs. Furthermore, you can select 'slice' mode from the top buttons to get a better look at your tunnel as it's mined out! How to Mine Moar: Sometimes you don't need a giant pit mine right away, but later want to extend your mine down a bit more than you initially planned for. Click the mine's marker and then click the 'sword' icon in it's window. Viola, mine adjustments! CAUTION! Adjusting the mine can sometimes make your existing stairs break, stranding the miners in the pit! How to Load 'N Kill: When you load a saved game, you'll get your saved 'Trons and a bunch of new ones, presumably the default ones for the map. Build a small bridge off the edge of the map, connected to land with only one block, if you can manage it. Pile the excess 'Trons on the bridge and have a builder 'remove' the support block >;D (It seems that sometimes they just get stuck floating in the air, unable to fall ??) More: Many of the 'zones' have more available options in the 'sword' menu. If anyone can figure out what the Ctrl-z / Ctrl-y icons in the tunnel menu do, please, do tell!