The 1987 Moria, ancestor of Angband: 50 levels down to the Balrog.
Umoria (1987) is the Unix version of Moria (1983), the game Angband grew out of. There is one town with six shops and one dungeon 50 levels (2500 feet) deep. At the bottom waits the Balrog; kill it to win. Levels are new every time you take the stairs. Death is permanent.
Umoria is Angband's ancestor, and much simpler. There are no artifacts to collect, no ego-item flood, fewer monsters and one fixed final foe, the Balrog at 2500 feet.