Angband is a single-player, text-based, dungeon simulation derived from the game Moria, which was in turn based on Rogue. It is often described as a “roguelike” game because the look and feel of the game is still quite similar to Rogue (though there are now graphical tiles available if you dislike ASCII gaming). Angband has been in more or less continuous development since the early 1990s.
Although angband is free, the sounds are under a non-commercial licence (Creative Commons BY-NC-SA) and are therefore considered non-free in Debian. Since the main game comes with no free sounds, install this package if you want sound.