An RPG set in the Hyperion Universe by Dan Simmons, a vast number of worlds connected by gates that make the Stargates of the film/series of that name look primitive in comparison. No idea about the story, never really thought about it, just the opportunity to explore that vast wonderful universe, and perhaps own a Farcaster home (imagine a house, with each room on a different world, all interconnected by gates).
You could probably make it an adventure game too if you used the first trilogy as a base, the 2nd trilogy would be a bit harder, since the network goes down at the end of the first set, not to mention the religious controversy the faction of "The Church" would cause.
You could probably make it an adventure game too if you used the first trilogy as a base, the 2nd trilogy would be a bit harder, since the network goes down at the end of the first set, not to mention the religious controversy the faction of "The Church" would cause.