ZorkQuest: The Crystal of Doom

ZorkQuest: The Crystal of Doom is a direct sequel to Assault on Egreth Castle. The gameplay system is identical to that of its predecessor, retaining the player's ability to either follow the narrative from a single character's point of view, or "jump" to a new character. Thus, the player is able to re-read the story and learn new things about how the characters' different paths affected each other, as well as the outcome of the entire story. (mobygames.com)