Patented easy-snap design allows you to build and take apart in seconds! This tabletop terrain is a fun, engaging, and interactive 3D alternative to paper adventure maps or a dry erase map. The Cavern Expansion Set is fully compatible with your Dungeons and Dragons, Pathfinder, Savage Worlds, and Frostgrave gaming systems. Compatible with all our Adventure Terrain and Mini Figure Sets and other 1-inch grid systems, allowing you to build endless designs for all your campaigning needs. 141 pieces in all.