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 (1982), which is a clone of Rogue (1980). 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."