Emily Short's game City of Secrets is a relatively-hidden gem. Started as a commercial project for a band, it's a sprawling city-based game that has much of the liveliness and intrigue of her later Counterfeit Monkey.
This game takes that same layout and room descriptions, but includes an 'Easter Egg Hunt' where you have to find 10 gems (and 1 super gem I didn't find) scattered throughout the layout of the game.
It does what it set out to well: encourage people to see and appreciate Short's setting and descriptions.
I had some difficulty guessing words (I'm used to Inform's synonyms like SEARCH being the same as LOOK IN), but the game had several hint systems, which was very useful.