What is "nethack"

NetHack is a single-player roguelike video game originally released in 1987 with ASCII graphics. It is a descendant of an earlier game called Hack , which is a clone of Rogue . Comparing it with Rogue, Engadget's Justin Olivetti wrote that it took its exploration aspect and "made it far richer with an encyclopedia of objects, a larger vocabulary, a wealth of pop culture mentions, and a puzzler's attitude." In 2000, Salon described it as "one of the finest gaming experiences the computing world has to offer."

The player chooses a character race and class; their mission is to retrieve the Amulet of Yendor in a randomly generated dungeon.