Fifteen takes its name from the traditional slide puzzle, with fifteen tiles arranged in a 4 x 4 grid, with the sixteenth spot left empty for tiles to move into. This was much appreciated. In fact, Fifteen is almost the sort of thing I was musing about enjoying in my previous review. However, what little prose there was in the game was richly written, and often funny. Adams' games are models of brevity, and Fifteen is just as terse, if not more.
Exits are south, east and north.
Now that's brief. I like to have at least a little feeling of immersion in my IF rather than unadorned puzzles. I find it very telling that even though Fifteen includes many more rooms and several more puzzles than Spotlight, the Inform file for Fifteen is actually 8K smaller than the Inform file for Spotlight. Nonetheless, Fifteen is clearly quite well-done, for what it is. The puzzles, as I said, are implemented well, and the author's ability to make me feel like I'm playing a Scott Adams game is nothing short of remarkable.