A solo map with a brand new idea along with some intriguing puzzles. Some very good construction on some of the levels. Basically you enter on a central area core shaft that will take you to the various levels (floors) on this map. (that you must repair) You must reach the goal of each floor and then access to the next floor will open. Some of the levels have long and sprawling hallways, but, they are done with some real taste at times. The level with the transport puzzle is the only one I didn't care for. (personal taste here) This map should challenge you and at the same time give you a appreciation of layers. Worth the download.