I have been wondering what the oldest surviving 3D MUD ( Multi User Dimension ) would be.
I think Active Worlds http://www.activeworlds.com is it, ( beta in 1994, released in 1995 ), but maybe you's know of something older than that.
I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.
~ Ralph Waldo Emerson