It was originally released in Steam Early Access on June 25, 2021.A sequel to the mobile games Hmmsim and Hmmsim 2, Hmmsim Metro puts players in the cab of one of multiple electric trains as they drive multiple scenarios on an unlicensed recreation of Seoul Subway Line 1 in Seoul, from Geumcheon-gu Office Station to Kwangwoon University Station.It features a recreated game engine built on Unreal Engine 4, significantly updating the graphics and audio for a more immersive experience. It also includes several new gameplay elements, such as a detailed cab view. Unlike the original games, it does not support add-ons from other train simulator games.
