On SciFiStories, clicking on Tags Definitions finds a tag 'Puzzles' with a story count of 1. Clicking on 'Puzzles' returns 11 stories, of which only one seems to bear the tag 'Puzzles' - Star Guardian 4 by Duncan7.
On FineStories, the story count for 'Puzzles' is 8, but clicking on it returns 53 stories.
(NB - SOL doesn't have a tag of 'Puzzles')
AJ