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Production of the project has been going for a long time since sometime around 2007. I worked on it as an on/off project. I did a Doom 2 compile attempt about 5 year's ago, been trying to make Doom 1/2 mods that compile levels for each game.
Open World Doom mod adding all Ultimate Doom levels as 1 single level.
Currently the mod has been done several times, I have decided to finally release a more stable version. Currently It let's players go from the start of episode 1 all the way to the end of episode 4 while letting the player explore everything, that includes the secret levels through multiply paths.
Also here's a preview: