The Fates of Twinion

The solo version of the sequel/add-on to the original Shadow of Yserbius, the
graphical multi-user dungeon game on The Sierra Network (which at this point
had become known as the Imagination Network). Once again brave warriors and
wizards are needed to enter dangerous dungeons and uncover the secrets of the
evils that plague the land.

Using the same engine as the original, the sequel provides more of the same: a
pure dungeon romp with squared-off dungeon maps, random encounters, and
treasure-strewn halls.

While gameplay remains the same, Sierra tried to get the most story and
diversity out of the engine and produced a somewhat more complex game, with a
wider range of puzzles, traps, and turns.