Doom 2. All Doom 2 episodes under one continuous level with no loading screens. Just a warning, this version is unstable, will try to make a new build eventually.
This is the full build of Doom 2 with every episode/map from Doom 2 compiled into one level/map.
Not recommend in single player and has known issues where the player dies from a unknown demon killing player on spawn, If anyone has any problems then please comment, I'll have a look.
Currently this build is mostly stable in most areas but unstable on spawns at start, end of the game. (Mostly recommended in game-types like multiplayer due to the random spawns letting the player spawn outside the kill zones)