Project Space (DOOM II WAD) - Gameplay (w/ commentary)
1A 20-level megawad created by Robert Juhl, taking place on some kind of UAC base on a new planet which, of course, has been overtaken by demons, most lack of story. The WAD comes with many large maps with innovative progression to the levels, with the levels representing different floors of the base as indicated by a blue circle with a number in front of an elevator thing or emulating a hub-based approach as you take a teleporter to enter a new area and the exit teleporter takes you back in the next level, but it kinda gets repetitive with the reappearing monsters. The final level is especially interesting. There are also three bonus levels included in their separate WADs, deviating from the playstyle of the main WAD and featuring keys unlike that.