Lost Civilization is a 22-level megawad for Doom II using Boom compatible source ports, created by Jaakko Impola (Jaska). It was originally released on October 14, 2019, with several patches swiftly following, and uploaded on the /idgames archive on December 30 that year. The megawad is famous for its realistic, exceptionally detailed and large maps set in Earthly locales, as well as the non-linear gameplay found in many of its maps. Lost Civilization received one of the 2019 Cacowards.