Master Levels for Doom II is an expansion pack for an action FPS Doom II. Since it is a map pack, many developers were involved with ID Software releasing the maps to the public. The expansion pack features 21 maps (the 21st one is a secret map) with some of the maps offering their own story. ###Story maps Titan.wad There is a secret science building on Titan, which contains a mighty alien weapon. Get in, kill the guards, solve puzzles, get out. Cabal.wad Once upon a time, you were the bigges...