Couple of things...
1) I would like to see a number or some ID designator with a puzzle and some way to retrieve that puzzle so I can try it again. Sometimes I spend hours yet still cannot complete it and would like to be able to call it back at another time.
2) OR... Some way to save a puzzle (if you are registered and logged in) so you can retrieve it later.
3) Finally... how a bout being able to look at your profile and see a list of puzzles competed (by ID designator - see #1 above), the date, number of clues used, time to complete, and average time of all users to complete that puzzle.