Read details its also interesting game, Ah memories to see it in OpenGL enhanced edition. https://www.gog.com/wishlist/games/in_pursuit_of_greed its source code available, but seems no body created a good source port. the game uses same engine as ShadowCaster, (RavenEngine) this engine is something between on evolution from Wolf3D to DOOM , its specially developed by id Software for Raven Software. Also more interesting facts you can read here. https://vk.com/shadowcaster http://doom.wikia.com/wiki/Doom_source_code_files http://doom.wikia.com/wiki/Rise_of_the_Triad The game sometimes remind me Strife game.