DOOM 2: The Plutonia Experiment; Hardest Doom Game Ever?
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Video of gameplay of The Plutonia Experiment , The Second half of Final Doom.
People say that The Plutonia Experiment is one of the hardest Doom wads ever published.
Final Doom was supposed to released on the internet in 1996,, but 10 hours before it was supposed to be released online, it was decided to be published for retail and people were outraged.
Read More on Wikipedia: https://en.wikipedia.org/wiki/Final_DoomChannel: Ben Wagner