Ragnarok is a freeware roguelike computer game for DOS, created by Norsehelm Productions from 1992 to 1995, also going by the name "Valhalla". It is distinct from many other roguelikes in having a graphical interface, a historical/mythological setting, set quests, the ability to change classes, and the ability to permanently change one's race by polymorphing.
Ragnarok is a highly interactive text-based online computer game (played using the Telnet protocol), known as a MUD (Multi-User Dungeon) that was started in 1994 and housed on a server in Portland, Oregon. Ragnarok was intended to be themed in a world and time similar to Medieval Europe, but not actually intended to be set in any known land. As a result of development latitude given to younger creators of the game by the administration, many deviations from this intended theme have been produced, explained away by the lack of limitations of "magic" required to create areas.