NetHack-- is a variant of several historic versions of NetHack, and a distant ancestor of SLASH'EM. Three versions of NetHack-- were released: * NetHack-- 3.0.10 was released in December 1992. It was briefly called NetHack++, but this led to a lot of silly questions about it being rewritten in C++. The name was changed NetHack-- to avoid the confusion. * NetHack-- 3.1.2 was released in June 1993 as binary only. Because NetHack 3.1.3 was released shortly after, no source for NetHack-- 3.1.2 was ever released. * NetHack-- 3.1.3 was released in August 1993. This was the last version of NetHack--.