JNetHack is Japanized NetHack, with all messages translated to
Japanese.

NetHack is a single-player roguelike video game released in 1987 with
ASCII graphics.  It is a descendent of an earlier game called Hack (1985),
which is a descendent of Rogue (1980).  The player takes the part of a
dungeon-delving character in search of the Amulet of yendor.