Tempora Heroica is a free-to-play, text-based online game known to most people as a MUD or multi-user dungeon. On the MUD, you can explore strange lands, meet colorful characters, and battle terrible monsters... all in the comfort of your own chair. The game is similar to Zork, but can support many players at once. It can be played by connecting through telnet titan.ibiblio.org 2895. More information is available on the Tempora Heroica website.
“Tempora Heroica,” ibiblio catalog, accessed June 18, 2013, http://ibiblio.org/catalog/items/show/3605.