"The first episode was originally released on December 10, 2012 for Doom's 19th birthday, featuring twenty regular levels, one secret level, and a recurring train station hub. An additional level was inserted in a later release on August 1, 2013. The first non-beta release was on February 27, 2017, and inserted another additional level. The episode received one of the 2013 Cacowards." -DoomWiki
Map21: Failed Experiments And Trashed Aircraft by hobomaster 22 and Tarnsman. Love this map, it's such cheeky fun and has oh-so-many Archviles stashed within its walls!
Doom II: Hell on Earth Statistics For EduardoAndFriends
EduardoAndFriends currently has 121,027 views spread across 372 videos for Doom II: Hell on Earth. The game makes up over 4 days of published video on his channel, roughly 73.66% of Doom II: Hell on Earth content that EduardoAndFriends has uploaded to YouTube.