2017 Cacoward winner, single level pk3 for Doom 2 created by Serious_MOod and TheSkyBug. A highly inventive level and has been equally influential to mappers.
*Crouching and Jumping required*
This level requires GZDoom to run, yet won't run on the newer versions of GZDoom (4.0 versions). Void and Rainbow is stable on GZDoom 3.2.0 so I've included the x64 version of GZDoom 3.2.0 in the zip.
Do not extract this zip directly to your existing gzdoom directory! it will overwrite all your files with this old version.
Extract this to a new folder, GZDOOMVoid or similar.
All you'll have to do is unzip this file to a new directory and then run the accompanying gzdoom.exe with the appropriate commandline "-iwad doom2.wad -file RAINBOW(GZD3.2.0).pk3 lights.pk3" or be a total heathen and drag the RAINBOW(GZD3.2.0).pk3 file onto the gzdoom.exe in the same folder, that'll work too.
A note from the authors found in the included text file:
"It's absolutely necessary to enable the OpenGL,
it's very desirable to include the dynamic lights
(well, some settings to them, so that they do not
shine through the walls, and that looks bad) and
Bloom, Sector Light Mode: Doom (if it's too dark,
it's better to correct the contrast), jumps and
squats are mandatory"