The Treasure of Mobius

It takes the questors most of the story to figure out where The Treasure of Mobius even takes place. They know only that they have landed in a world so internally inconsistent that it should only exist in someone's imagination—which is precisely the case. Its creator, a powerful projective telepath, is just creating the place as an adventuring milieu for his friends when the questors come barreling through their Portal, entering the scenario and pulling the telepath with them. His well-designed characters come to life and suddenly have free agency. Four warring crime families and a band of pirates are out to solve the problem of who will run the place by participating in a fiendish road rally designed by Mobius' governor-general—and they demand that the governor-general force the questors to help! Despite the action, this story is heavily character-driven, and we get a peek into the psyches of the main characters, what motivates them, and what they most fear. And yes, there are one-sided buildings.