All levels are designed for vanilla Doom2. Recommended engines: prBoom-plus with "-complevel 2" and (G)ZDoom in "DOOM (strict)" compatibility mode. Jumping should be disabled.
For OpenGL ports like GZDoom and GLBoom-Plus you can add EPIC2GL.WAD after EPIC2.WAD for HI-RES skies: glboom-plus -file epic2.wad epic2gl.wad
Credits:
Andrey Budko, Never_Again, Hitherto and authors of used resources.
Textures and flats: Powerslave, Hexen, Hexen2, Half-life, Kingpin, DeusVult2, Eternal IV, Alice, Doom3, urbanterror, Gunman Chronicles, water flat is made by esselfortium.
Sprites: Powerslave, darkimp, Realm 667.
Sounds: Powerslave, rylayeh.wad.
Music: "Spacehunter: Adventures in the Forbidden Zone" by Elmer Bernstein (1983) (map18).