There's a whole genre of magical apprentice games: you're left to your own devices in a wizard's sanctum, a tower, or castle, with a lot of puzzles to solve in aid of furthering your magical education. The Apprentice is a game in this genre, with something of a story— very cod fantasy but still, a bit of a mystery and some motivation. The various puzzles tend towards breaking apart the scenery and using bits in various ways. For the time, there's some player friendly elements to make it a little harder to get stuck.
Of its kind, a good example, though it has now been surpassed.
Technically beatable maze for someone with a lot of patience and/or bloodymindedness.
This isn't really a game, but a pretty funny joke on automated actions. I laughed. I already knew, from a forum post (Spoiler - click to show)http://www.intfiction.org/forum/viewtopic.php?f=22&t=3766&start=10 what the correct first command to try was. If I was playing it as if it were a proper game it might not have been so satisfying.