Statistics on Difficulty of Sudokus

There is now reliable, objective way to measure the difficulty of a given Sudoku. Therefore these statistics compiled from how fast or slow humans solved the Sudokus on the one hand, and how many people solved a given Sudoku on the other hand.

Average Solving Time

All times are given in Seconds.

Overall Statistics

Average	568
Std. Deviate	94
Minimum	60
Maximum	2543

Easiest and Hardest Sudokus

The Sudokus that were solved fastest/slowest on average.

	Easiest		Hardest
No	Mean Time [s]	Sudoku	Mean Time [s]	Sudoku
1	60	2026-10-10	2543	2026-01-03
2	60	2006-06-05	1692	2011-01-22
3	350	2017-06-09	1199	2013-07-09
4	352	2019-08-09	1080	2006-10-14
5	362	2015-06-29	1061	2011-06-30
6	365	2018-01-17	1029	2010-04-21
7	366	2013-05-02	979	2008-10-29
8	366	2020-07-10	971	2022-01-28
9	369	2013-05-03	951	2009-11-18
10	371	2013-05-01	942	2010-02-06
11	372	2020-08-09	936	2013-03-06
12	373	2015-06-28	917	2013-08-21
13	375	2007-06-16	916	2012-02-04
14	376	2019-09-27	904	2010-12-25
15	377	2017-10-13	898	2010-10-06

Number of People Who Solve a Sudoku

Most Difficult Sudokus

These Sudokus have been solved lest often: