Someone just put up a server that lets a group of four people play Zork 1. This is not a MUD; it’s using the original release-88 Z-code file! The Z-code interpreter has been heavily hacked to do a sort of bank-switching for multiple player objects.
Access is by telnet: http://telnet//multizork.icculus.org/
Project explanation: https://www.patreon.com/posts/54997062