Name changed to Maps of Chaos January 10th, 2015. Update to RC 1.25 on January 18th: Modifications to MAP20 and MAP21. "Full Package" includes the original and hardcore versions as well. If you thought MoC Hardcore was tough, you haven't seen anything yet. MoC Overkill will throw more at you and will generally won't give you a breather for your trigger finger. For the bloodthirsty and masochistic players, be it alone or with friends in co-op! Standard and Hardcore editions are on the downloads list on the description.
This is a project that originally stemmed from a file I named "Doom Co-op" which started off way back in 2006 or 2007 with increased monster count more or less plus a few sound and minor graphics visuals but I eventually moved into actually adding new sections to both original sets of maps (except episode 4 of Doom) on top of making it suitable for single and co-op multiplayer.
The biggest difference between MoC Standard and MoC Hardcore is that I fixed up all the unclosed sector errors (courtesy of id that went unnoticed and were extremely minor) and some goof ups of my own (the E2M6 lowering floor HOM near start) when I jacked up the difficulty for Hardcore, on top of additional edits to two later Doom 2 levels.
On a side note, playing this with vanilla Doom or Doom 2 is not recommended as there are some linedefs that utilize Boom style line actions and at times more than 128 sprites visible in really hectic battles so if one must play "pure", use a limit removing port such as Boom/prBoom as the bare minimum.
Note: This is not Brutal Doom exclusive! You can play this with any mod you desire or even without mods!
Second note: This version is an official upload by the author and not by an unauthorized third party.
These are replacement levels only and is not an IWAD, so these cannot be used as an IWAD to circumvent the need for an IWAD to use PWADs.
MoC Standard - v1.02 Final. No longer updated or supported.
MoC Hardcore - v.1666 "Hell on Earth" edition, Last updated 3/3/13. No longer updated or supported.
MoC Overkill 1.27 - Very difficult version of the original maps. Last updated 6/19/16
Overkill: About 82% complete. E1M1 through E3M2 and MAP01 through MAP26 are Overkill'ized.
11-29-16 WIP 1.28:
-Minor fixes to MAP04 regarding teleport ambush in main corridors.
-Mine-like areas added to MAP26
-Fixed monster stuck in MAP26
-Work on MAP27
What's new in 1.25 to 1.27:
RC 1.26 to 1.27:
-Additional work done on MAP23, MAP24 and MAP25.
-Title picture added!
-Console background added!
RC 1.26 to 1.27:
-Added cover to E3M1's starting area.
-Completed E3M9, using E3M1 as a base and building on top of it.
RC 1.25 to 1.26:
-Modifications to E1M9 to make it the cruelest E1 map so far.
Random Deaths & Decoration - Great alternative to Brutal Doom but maintains classic vanilla gameplay. Alters only monsters and some gore, so use whatever weapons mod that doesn't mess with monster and corpse/gore/tree actors.
Project Doomed - Edit of Silentzorah's tunes to sound closer to the original soundtrack.
Project Final Doomed - Same as above but for Final Doom and those using Evilution or Plutonia IWADs to fire up this level set.
Optional Brutal music - For Ultimate Doom. Updated 3/2/13. Changed some songs around from D2 version.
Optional Brutal music - For Doom 2. Updated 3/2/13
Rock It! 2.5 - For both Doom & Doom 2. Completely new music to use. Uploaded 7/17/13
Brutal Mix Up - For Both Doom & Doom 2. Combines tunes from Rock It and Brutal Music WADs. Uploaded 7/31/13.
Optional third party downloads:
Doom Music Inversion - Changes high notes to low and vice versa. For both Doom games and works on Vanilla DOOM.EXE.
Derivative projects by others: Doom Extended Edition, by Conan - Comment link