Here is a complete list Units in Quake II which makes up the singleplayer story. Each Unit contains a list of the maps, each of which contain a complete walkthrough (ongoing). A video walkthrough can also be found on the Unit pages (again ongoing).
Quake II Hard+ is a Video Walkthrough of Quake II. This walkthrough provides a 100% look at Quake II from start to end (pending). Below are links to each unit that has so far been made. These videos will give visitors to QuakeWiki extra information about the game aswell as a walkthrough for anyone who might need help. The other Units will be made and added in time.