https://doomwiki.org/wiki/MAP05:_YesBasV._1.2._(Oops!_All_Greyboxes!)
MAP05: YesBasV. 1.2. (Oops! All Greyboxes!) - The Doom Wiki at DoomWiki.org
MAP05: YesBasV. 1.2. is the fifth map of Oops! All Greyboxes!. It was designed by HUNdebLeonidasX and uses the music track "Escape Cavern" from Mega Man:...