Major Series Giveaway #37 - DOOM [MAJOR]

Doesn't have "The Only Thing They Fear Is You" but it's still alright... I guess.

All kinds of comments welcome!
Good luck to win and have fun if you do!

KEY DOES NOT WORK FOR:
United States, Canada, Australia, Brunei Darussalam, China, Hong Kong, India, Japan, New Zealand, Singapore, Taiwan

Major Series [MAJOR] - Mainstream games as well as generally popular and cult hit ones; they often have "AAA" production quality or high monetary value.
Minor Series [MINOR] - Almost everything else, usually something that is good but not quite popular or valuable enough to warrant Major status.
???? Series [????] - To Be Revealed.