This map is more like a tutorial. It shows you some tricks, strange phenomenons and stuffs like that, which can be carried out in plain Quake. Near each thing there is a button with a question mark on it, which tells you how to create the thing. The MAP source is also attached in the ZIP file, so you can check it out exactly in a map-editor. The whole map is flat like a Wolfenstein level, so the XY view of the MAP file is very synoptical.