Armadosia: The Mad Corridor

Armadosia: The Mad Corridor is a megawad for Doom II, meant for limit-removing source ports. It was designed by David Rivette (Arma Kero), and features 32 very large, exploration-focused levels, plus a host of new textures and flats, but no new music or story. It was originally released on March 1, 2005, and saw several updates containing bug and compatibility fixes over the years, with the latest version (2.1) being released in May 2016.