Ultima Underworld II: Labyrinth of Worlds

In an attempt to conquer the world, the Guardian traps Castle Britannia and its inhabitants - including the Avatar - in a giant black stone. The game takes place one year after the events of Ultima 7: The Black Gate. To celebrate the victory over the Guardian, Lord British invites the Avatar and his companions to his castle. But on the night of the feast, the Guardian attacks again, enveloping the castle in a giant gem of black rock. Deep in the sewers of the castle is another blackrock gem, which is a teleporter to other worlds controlled by the Guardian. Now you, the Avatar, must travel to these worlds to free the castle from the Guardian's spell. This sequel to Ultima Underworld plays just like the original, only with a larger game world, a more extensive story and better graphics and sound.