Publisher's blurb: Expansion Sets are collections of tiles that include a mix of all Dungeons in Blue corridor and room styles: standard 10-, 20- and 30-foot passages and tunnels, sewers, and mines, all connecting the usual array of caves, chambers, rooms and caverns. The set has two versions of each geomorph, one for players, and one for GMs. The GM's version shows additional features, tricks, and traps.