Everquest is a online game similar to "Ultima Online" - What you
do is buy the "client" software at a local software vendor
and then install it. You then pay $10 to log over the internet and play
online with thousands of other people. The game is more or less
similar to AD&D.
However, there are games similar to everquest for free on
the internet. They are called "MUDS" Multi-User-Dungeons.
They are all text-based - like the old Zork games. I am an
administrator on one of them. I often thought about making
some Groo-Theme'd area/rooms/monsters for players
to encounter/fight etc. I would ask for permission of
course and make sure I displayed any copyright notice
and such if I used any names/cities/places from the comic.