multizork hello sailor!
https://multizork.icculus.org/

>multizork
>
>>read leaflet
>
>What is this?
>
>This is an experiment in turning Zork 1 into a multiplayer game. Up to four players can explore the Great Underground Empire at the same time, interacting with the world together or apart.
>
>Sometimes this introduces new solutions to puzzles. Sometimes it breaks the game in hilarious ways.
>
>How do I play?
>
>You need a telnet client and some friends.
>
>Telnet to multizork.icculus.org, start a game and tell your friends the access code.
>...

Further reading:
Project: multizork Ryan C. Gordon on Patreon
https://www.patreon.com/posts/54997062

This looks really interesting but I think I will need some time in Zork before trying the online game. The reading also had some of the history of Zork.