It includes complete walkthroughs for every map of every doom game. It includes story background, history, speedrun paths and instructions for all secrets on all maps. The only drawback is that secrets are explained with text.
This is a great site for Doom 1 and Doom 2 resources. It includes the maps of all episodes with options to display keys, teleports and secrets. Secrets and teleports are displayed visually on the maps.Continue reading Doom links