I too am surprised at the quick times posted. A statistical analysis of the bulk data collected might prove amusing.
I'd suggest the developer make a small inclusion with the uploaded time for each solution.. the system timestamp at first display of puzzle, and the system timestamp at solution. This being done behind the UI scene without player control or intervention (no optional flag setting). Discrepancies place the results in a separate bin on your server for comparisons (at a much later point, allowing time for data collection showing trends w/o player forethought). Do you (the developers) generate a unique hash on the puzzles? This might provide another criterion for ranking.. I certainly know of some "easy" being "hard" and vice versa.
I'm sure someone in a university psyc lab somewhere would love to have the resulting data.
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