Let the Obsession begin. Again. This time, the entire forces of the netherworld have overrun Earth. To save her, you must descend into the stygian depths of Hell itself! Battle mightier, nastier, deadlier demons and monsters. Use more powerful weapons. Survive more mind-blowing explosions and more of the bloodiest, fiercest, most awesome blastfest ever! Play DOOM II solo, with two people over a modem, or with up to four players over a LAN (supporting IPX protocol). No matter which way you choose, get ready for adrenaline-pumping, action-packed excitement that's sure to give your heart a real workout.
This is an large file from the Internet Archive, I got it an year ago and decided to archive it here, It's an CD called Maximum Doom, It contains levels for DooM and DooM II, Part of the infamous Master Levels for Doom II All credits are in this readme and this file is not by me, Nor do I take credit for it either.
I believe I found where you Maximum Doom came from: Doom.fandom.com
Basically, it's extra community made maps ID released with Master Levels in the mid 90s. They don't sell it anymore, so you have to download it from archives or reddit posts.
Ah thank you, I shall edit the file to reflect on the credits and info