Wishbringer

From Wikipedia

Wishbringer: The Magick Stone of Dreams is an interactive fiction computer game written by Brian Moriarty and published by Infocom in 1985. It was intended to be an easier game to solve than the typical Infocom release, and provide a good introduction to interactive fiction for inexperienced players. It was one of five top-selling titles to be re-released in Solid Gold versions including in-game hints.

The player's character is a postal clerk in the small fishing village of Festeron. The cranky postmaster, Mr. Crisp, orders the player to deliver an important envelope to the proprietor of Ye Olde Magick Shoppe. The proprietor in question, a kindly old lady, then asks the player to rescue her cat from a sorceress known only as The Evil One. Stepping out of the store, the player finds that quaint Festeron has mysteriously been transformed into a more sinister town called Witchville. Every aspect of Festeron has been changed to something ominous: for instance, what was once a poodle is now a frightening hellhound.

Fortunately, the player soon finds the Wishbringer, a magical stone that can grant seven wishes if a suitable object is used in conjunction. (To see the future, for example, the player must be wearing glasses and holding the stone.)