[Milawe]

I was thinking of something like the Red Mars series by Kim Stanley Robinson where you actively try to colonize another planet and deal with all the issues surrounding that. All the challenges of terraforming and moving on to various planets could be very exciting, imo.

Or you could do Ender's Game type of idea where you do end up battling for the survival of the human species via computer generated means. The players wouldn't need to know the science so much as the creators/builders of the mud. I could have sworn that there were some out there that were more than just science fantasy. I hadn't given the genre a shot yet, so I don't actually know.

What about the Star Trek muds? Are they heavy into the science fiction rather than the science fantasy?