The last sequel in the MYST franchise was URU:Ages Beyond Myst, and had one expansion. It grew, and they contracted with a super server site, I forget who, and renamed it URU:Online. Anywho... after a time Superserversite, decided there weren't enough subscriptions to keep the service going. The licensing reverted back to Cyan, but for a period of time Cyan was barred from servicing their own game on their own servers. Meanwhile, player fanbase created their own server cluster and Cyan gave permission for player created worlds.
The new setup was quite complicated, and I never got around to having enough time to figure it all out, but eventually still want to do it.
It was such a great game, peaceful world, mysterious creatures, great graphics, and the online community was stellar. It was a really great escape from reality.