Below is a table of scores for Iron Sudoku puzzles going back to the first puzzle published on March 11, 2006. As new puzzles are published, I will normally publish the scores here and in the Iron Sudoku chatterbox on the same day, but no promises. Some of these scores will not agree with what I first posted in the Iron Sudoku chatterbox. That is because I have changed the scoring algorithm a couple of times since I first started posting the scores. I have gone back and redone the scores using the latest version of the program for this table.

There is a very basic statistical analysis of the scores at the bottom of this page. The mean score and standard deviation are given for each class (Easy, Medium, Hard and Expert) of puzzle and for all the puzzles collectively. There is a histogram showing the distribution of the scores too.

You can use the Table of Contents below to find what you are looking for. You can click on any score in the table to go to the Iron Sudoku archives and view the puzzle.

Scores

2008: January February March April May June July August September October November
2007: January February March April May June July August September October November December
2006: March April May June July August September October November December

Statistics

Frequency Distribution of Scores

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Scores

2008

Average score: 27.55
November 2008
Sun	Mon	Tue	Wed	Thu	Fri	Sat
						1 Medium 35
2 Expert 39	3 Hard 23	4 Easy 10	5 Easy 12	6 Easy 24	7 Medium 29	8 Medium 32
9 Medium 27	10 Hard 37	11 Expert 52	12 Medium 20	13 Easy 19	14 Medium 21	15 Hard 44
16 Easy 14	17 Medium 24	18 Hard 33	19 Medium 27	20 Easy 29	21	22
23	24	25	26	27	28	29
30

Average score: 28.45
October 2008
Sun	Mon	Tue	Wed	Thu	Fri	Sat
			1 Medium 30	2 Medium 22	3 Expert 61	4 Hard 29
5 Easy 30	6 Medium 19	7 Easy 23	8 Expert 61	9 Hard 34	10 Easy 21	11 Hard 30
12 Easy 20	13 Medium 26	14 Easy 19	15 Easy 27	16 Expert 61	17 Easy 30	18 Medium 23
19 Expert 34	20 Easy 17	21 Medium 23	22 Medium 31	23 Easy 26	24 Medium 20	25 Easy 18
26 Medium 35	27 Hard 27	28 Medium 17	29 Medium 35	30 Easy 18	31 Easy 15

Average score: 24.83
September 2008
Sun	Mon	Tue	Wed	Thu	Fri	Sat
	1 Hard 32	2 Easy 23	3 Medium 28	4 Medium 36	5 Medium 20	6 Easy 16
7 Hard 29	8 Easy 19	9 Medium 19	10 Easy 20	11 Easy 14	12 Easy 21	13 Easy 16
14 Medium 24	15 Easy 14	16 Medium 30	17 Easy 22	18 Easy 27	19 Easy 23	20 Medium 25
21 Easy 23	22 Hard 31	23 Expert 33	24 Hard 29	25 Hard 29	26 Easy 18	27 Expert 47
28 Easy 28	29 Easy 23	30 Easy 26

Average score: 23.58
August 2008
Sun	Mon	Tue	Wed	Thu	Fri	Sat
					1 Easy 14	2 Easy 20
3 Expert 38	4 Medium 20	5 Hard 25	6 Easy 13	7 Medium 23	8 Medium 35	9 Easy 22
10 Hard 34	11 Easy 16	12 Hard 33	13 Medium 27	14 Easy 15	15 Medium 23	16 Hard 27
17 Easy 17	18 Medium 20	19 Medium 17	20 Medium 23	21 Hard 37	22 Easy 18	23 Easy 24
24 Medium 23	25 Medium 32	26 Medium 19	27 Medium 30	28 Hard 25	29 Hard 34	30 Easy 19
31 Easy 8

Average score: 30.10
July 2008
Sun	Mon	Tue	Wed	Thu	Fri	Sat
		1 Easy 25	2 Medium 16	3 Hard 37	4 Hard 43	5 Hard 38
6 Medium 29	7 Hard 35	8 Easy 19	9 Expert 64	10 Hard 37	11 Easy 28	12 Expert 47
13 Medium 22	14 Easy 22	15 Medium 21	16 Medium 27	17 Hard 35	18 Hard 39	19 Easy 13
20 Hard 30	21 Medium 28	22 Expert 53	23 Medium 23	24 Medium 22	25 Medium 28	26 Easy 20
27 Hard 39	28 Medium 33	29 Easy 14	30 Easy 22	31 Hard 24

Average score: 24.23
June 2008
Sun	Mon	Tue	Wed	Thu	Fri	Sat
1 Hard 40	2 Easy 14	3 Medium 31	4 Easy 18	5 Medium 27	6 Medium 21	7 Easy 16
8 Medium 33	9 Easy 20	10 Easy 12	11 Medium 36	12 Hard 35	13 Medium 35	14 Easy 22
15 Medium 33	16 Easy 12	17 Medium 31	18 Easy 25	19 Easy 16	20 Medium 27	21 Easy 15
22 Easy 21	23 Easy 22	24 Easy 12	25 Easy 15	26 Hard 29	27 Hard 30	28 Easy 19
29 Medium 28	30 Medium 32

Average score: 25.32
May 2008
Sun	Mon	Tue	Wed	Thu	Fri	Sat
				1 Easy 11	2 Medium 30	3 Medium 27
4 Easy 25	5 Hard 43	6 Easy 29	7 Easy 14	8 Medium 34	9 Medium 25	10 Medium 23
11 Easy 13	12 Expert 58	13 Medium 19	14 Medium 21	15 Easy 21	16 Medium 21	17 Easy 29
18 Easy 18	19 Medium 20	20 Medium 35	21 Medium 27	22 Expert 73	23 Medium 14	24 Hard 32
25 Easy 21	26 Easy 15	27 Easy 20	28 Medium 22	29 Easy 15	30 Easy 16	31 Easy 14

Average score: 25.53
April 2008
Sun	Mon	Tue	Wed	Thu	Fri	Sat
		1 Easy 12	2 Medium 34	3 Expert 43	4 Medium 32	5 Medium 25
6 Easy 23	7 Medium 24	8 Expert 33	9 Medium 28	10 Medium 17	11 Hard 36	12 Medium 21
13 Easy 13	14 Easy 25	15 Easy 24	16 Easy 16	17 Easy 16	18 Medium 24	19 Expert 42
20 Easy 10	21 Hard 35	22 Medium 16	23 Medium 31	24 Easy 15	25 Hard 41	26 Medium 26
27 Easy 16	28 Medium 42	29 Medium 18	30 Easy 28

Average score: 28.13
March 2008
Sun	Mon	Tue	Wed	Thu	Fri	Sat
						1 Expert 51
2 Medium 34	3 Medium 23	4 Hard 40	5 Easy 18	6 Hard 29	7 Hard 32	8 Easy 13
9 Hard 35	10 Easy 24	11 Medium 31	12 Hard 31	13 Hard 35	14 Medium 24	15 Expert 39
16 Easy 16	17 Hard 34	18 Easy 24	19 Easy 24	20 Medium 22	21 Easy 12	22 Hard 27
23 Medium 20	24 Hard 42	25 Medium 19	26 Expert 52	27 Medium 28	28 Hard 41	29 Easy 18
30 Easy 24	31 Easy 10

Average score: 27.14
February 2008
Sun	Mon	Tue	Wed	Thu	Fri	Sat
					1 Easy 24	2 Hard 44
3 Easy 15	4 Easy 14	5 Medium 25	6 Medium 26	7 Medium 36	8 Easy 17	9 Medium 37
10 Easy 23	11 Medium 21	12 Medium 20	13 Hard 37	14 Easy 11	15 Medium 26	16 Easy 25
17 Easy 16	18 Medium 27	19 Easy 25	20 Medium 29	21 Expert 48	22 Easy 28	23 Easy 15
24 Easy 13	25 Easy 17	26 Expert 57	27 Hard 37	28 Expert 39	29 Hard 35

Average score: 25.65
January 2008
Sun	Mon	Tue	Wed	Thu	Fri	Sat
		1 Easy 21	2 Medium 20	3 Medium 25	4 Hard 38	5 Expert 50
6 Easy 19	7 Hard 28	8 Hard 29	9 Medium 20	10 Expert 56	11 Expert 40	12 Easy 15
13 Medium 19	14 Easy 22	15 Medium 32	16 Easy 16	17 Medium 16	18 Medium 27	19 Hard 29
20 Hard 42	21 Easy 14	22 Medium 23	23 Easy 19	24 Easy 11	25 Easy 13	26 Easy 17
27 Expert 62	28 Easy 15	29 Easy 15	30 Easy 15	31 Easy 27

2007

Average score: 27.23
December 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
						1 Easy 26
2 Expert 76	3 Hard 40	4 Easy 10	5 Easy 10	6 Hard 27	7 Easy 11	8 Hard 34
9 Hard 34	10 Medium 26	11 Easy 24	12 Medium 29	13 Easy 20	14 Easy 24	15 Easy 19
16 Easy 22	17 Hard 30	18 Medium 35	19 Easy 14	20 Medium 28	21 Medium 20	22 Expert 45
23 Medium 26	24 Medium 25	25 Medium 29	26 Easy 11	27 Medium 31	28 Expert 48	29 Hard 33
30 Easy 11	31 Easy 26

Average score: 22.97
November 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
				1 Easy 16	2 Easy 14	3 Hard 28
4 Medium 20	5 Easy 12	6 Easy 21	7 Easy 10	8 Medium 27	9 Easy 21	10 Easy 15
11 Hard 47	12 Medium 22	13 Easy 13	14 Easy 18	15 Medium 27	16 Medium 27	17 Hard 25
18 Easy 8	19 Expert 50	20 Medium 26	21 Easy 11	22 Medium 24	23 Easy 23	24 Medium 25
25 Hard 37	26 Hard 28	27 Hard 28	28 Medium 24	29 Hard 28	30 Easy 14

Average score: 25.23
October 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
	1 Easy 21	2 Hard 23	3 Easy 17	4 Medium 24	5 Medium 28	6 Easy 33
7 Expert 45	8 Medium 27	9 Hard 24	10 Medium 31	11 Medium 23	12 Easy 20	13 Medium 20
14 Hard 27	15 Easy 24	16 Medium 33	17 Medium 25	18 Easy 12	19 Hard 23	20 Easy 17
21 Easy 17	22 Easy 20	23 Hard 35	24 Hard 39	25 Medium 28	26 Easy 21	27 Hard 36
28 Easy 22	29 Medium 30	30 Easy 15	31 Medium 22

Average score: 27.93
September 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
						1 Expert 57
2 Easy 17	3 Medium 24	4 Easy 16	5 Hard 37	6 Medium 19	7 Easy 15	8 Expert 73
9 Medium 31	10 Easy 15	11 Expert 47	12 Medium 29	13 Hard 35	14 Easy 11	15 Medium 29
16 Hard 28	17 Hard 32	18 Easy 17	19 Medium 16	20 Hard 32	21 Easy 14	22 Hard 44
23 Easy 31	24 Medium 29	25 Easy 26	26 Hard 35	27 Easy 15	28 Easy 15	29 Medium 25
30 Medium 24

Average score: 24.58
August 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
			1 Medium 32	2 Medium 27	3 Easy 12	4 Hard 36
5 Easy 21	6 Medium 24	7 Expert 33	8 Easy 19	9 Easy 12	10 Hard 31	11 Hard 22
12 Medium 26	13 Hard 28	14 Hard 40	15 Expert 36	16 Medium 27	17 Easy 11	18 Easy 27
19 Easy 22	20 Easy 23	21 Easy 26	22 Easy 14	23 Easy 26	24 Easy 18	25 Medium 19
26 Medium 18	27 Easy 10	28 Hard 34	29 Easy 26	30 Medium 25	31 Hard 37

Average score: 25.10
July 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
1 Medium 26	2 Easy 15	3 Medium 31	4 Easy 23	5 Easy 16	6 Hard 29	7 Easy 23
8 Hard 31	9 Hard 43	10 Hard 34	11 Medium 28	12 Medium 19	13 Medium 27	14 Easy 21
15 Easy 23	16 Hard 23	17 Medium 34	18 Medium 20	19 Easy 21	20 Easy 20	21 Medium 21
22 Medium 22	23 Medium 20	24 Medium 32	25 Hard 32	26 Easy 20	27 Easy 16	28 Expert 43
29 Easy 16	30 Easy 20	31 Easy 29

Average score: 31.90
June 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
					1 Easy 17	2 Easy 18
3 Easy 14	4 Easy 10	5 Expert 66	6 Hard 50	7 Hard 27	8 Easy 17	9 Easy 15
10 Easy 16	11 Hard 22	12 Expert 60	13 Easy 12	14 Medium 20	15 Medium 19	16 Expert 78
17 Easy 10	18 Medium 27	19 Expert 47	20 Easy 18	21 Easy 23	22 Expert 101	23 Hard 29
24 Medium 38	25 Medium 32	26 Hard 30	27 Expert 69	28 Medium 32	29 Hard 23	30 Easy 17

Average score: 22.84
May 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
		1 Easy 19	2 Medium 32	3 Medium 28	4 Easy 15	5 Expert 46
6 Easy 17	7 Hard 24	8 Easy 18	9 Easy 15	10 Easy 21	11 Medium 20	12 Expert 41
13 Easy 23	14 Medium 14	15 Easy 9	16 Easy 16	17 Easy 20	18 Easy 19	19 Easy 16
20 Easy 18	21 Easy 9	22 Medium 27	23 Easy 21	24 Hard 36	25 Hard 27	26 Easy 15
27 Expert 39	28 Hard 26	29 Medium 30	30 Easy 20	31 Hard 27

Average score: 23.13
April 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
1 Hard 36	2 Hard 37	3 Medium 16	4 Easy 20	5 Medium 23	6 Easy 11	7 Easy 13
8 Easy 24	9 Expert 42	10 Hard 33	11 Easy 12	12 Easy 32	13 Medium 30	14 Easy 28
15 Medium 18	16 Easy 17	17 Medium 18	18 Easy 15	19 Medium 28	20 Easy 20	21 Medium 27
22 Easy 10	23 Easy 24	24 Easy 24	25 Easy 24	26 Easy 14	27 Medium 28	28 Medium 30
29 Easy 15	30 Medium 25

Average score: 23.16
March 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
				1 Easy 10	2 Easy 10	3 Medium 19
4 Easy 25	5 Hard 33	6 Medium 21	7 Easy 11	8 Easy 23	9 Easy 20	10 Easy 17
11 Hard 35	12 Easy 24	13 Easy 17	14 Easy 13	15 Easy 13	16 Easy 21	17 Medium 22
18 Easy 19	19 Expert 49	20 Easy 19	21 Easy 18	22 Medium 24	23 Hard 21	24 Expert 71
25 Expert 44	26 Easy 14	27 Easy 28	28 Easy 11	29 Easy 30	30 Easy 15	31 Medium 21

Average score: 27.54
February 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
				1 Easy 20	2 Easy 12	3 Hard 25
4 Easy 22	5 Medium 38	6 Easy 16	7 Expert 60	8 Medium 28	9 Easy 13	10 Medium 20
11 Easy 15	12 Medium 14	13 Expert 71	14 Medium 34	15 Easy 11	16 Hard 36	17 Easy 20
18 Easy 29	19 Hard 35	20 Medium 25	21 Medium 33	22 Medium 23	23 Expert 29	24 Easy 17
25 Expert 58	26 Easy 17	27 Easy 16	28 Hard 34

Average score: 23.26
January 2007
Sun	Mon	Tue	Wed	Thu	Fri	Sat
	1 Medium 26	2 Easy 17	3 Easy 13	4 Medium 21	5 Easy 21	6 Medium 30
7 Easy 15	8 Medium 23	9 Hard 31	10 Easy 11	11 Easy 14	12 Medium 31	13 Easy 22
14 Medium 34	15 Easy 20	16 Hard 29	17 Medium 30	18 Easy 22	19 Medium 24	20 Medium 27
21 Medium 18	22 Medium 23	23 Medium 20	24 Hard 49	25 Medium 23	26 Hard 19	27 Easy 15
28 Easy 26	29 Hard 29	30 Medium 26	31 Easy 12

2006

Average score: 26.61
December 2006
Sun	Mon	Tue	Wed	Thu	Fri	Sat
					1 Expert 45	2 Hard 28
3 Hard 22	4 Medium 16	5 Hard 24	6 Medium 23	7 Easy 8	8 Hard 45	9 Medium 30
10 Hard 23	11 Medium 28	12 Medium 26	13 Medium 24	14 Easy 14	15 Expert 38	16 Easy 11
17 Medium 40	18 Easy 16	19 Easy 20	20 Easy 11	21 Expert 47	22 Medium 24	23 Hard 33
24 Hard 22	25 Easy 25	26 Hard 40	27 Easy 13	28 Medium 27	29 Easy 20	30 Expert 42
31 Hard 40

Average score: 23.57
November 2006
Sun	Mon	Tue	Wed	Thu	Fri	Sat
			1 Easy 26	2 Hard 34	3 Hard 36	4 Easy 11
5 Easy 12	6 Medium 30	7 Easy 18	8 Expert 44	9 Easy 23	10 Medium 25	11 Easy 18
12 Medium 27	13 Easy 22	14 Easy 16	15 Medium 25	16 Easy 12	17 Medium 27	18 Medium 33
19 Easy 24	20 Easy 16	21 Easy 21	22 Easy 19	23 Easy 16	24 Medium 27	25 Easy 14
26 Hard 34	27 Medium 26	28 Hard 22	29 Medium 30	30 Easy 19

Average score: 24.81
October 2006
Sun	Mon	Tue	Wed	Thu	Fri	Sat
1 Expert 94	2 Easy 19	3 Easy 30	4 Expert 33	5 Medium 19	6 Easy 14	7 Easy 10
8 Hard 25	9 Easy 21	10 Medium 24	11 Medium 22	12 Easy 16	13 Medium 24	14 Medium 28
15 Hard 36	16 Easy 22	17 Hard 37	18 Easy 17	19 Medium 38	20 Easy 8	21 Easy 25
22 Easy 20	23 Easy 20	24 Medium 19	25 Easy 18	26 Medium 28	27 Easy 19	28 Easy 26
29 Medium 19	30 Easy 10	31 Medium 28

Average score: 25.33
September 2006
Sun	Mon	Tue	Wed	Thu	Fri	Sat
					1 Hard 40	2 Easy 19
3 Expert 56	4 Easy 16	5 Easy 18	6 Easy 22	7 Medium 28	8 Medium 32	9 Medium 34
10 Easy 18	11 Easy 17	12 Easy 17	13 Hard 33	14 Hard 30	15 Easy 12	16 Hard 35
17 Hard 28	18 Medium 29	19 Medium 18	20 Hard 33	21 Medium 18	22 Medium 24	23 Hard 29
24 Hard 30	25 Easy 18	26 Easy 16	27 Medium 21	28 Easy 15	29 Medium 32	30 Easy 22

Average score: 26.19
August 2006
Sun	Mon	Tue	Wed	Thu	Fri	Sat
		1 Easy 20	2 Expert 94	3 Easy 18	4 Medium 28	5 Easy 23
6 Hard 26	7 Easy 13	8 Expert 35	9 Medium 28	10 Hard 31	11 Hard 30	12 Easy 17
13 Easy 21	14 Hard 25	15 Medium 30	16 Medium 28	17 Hard 33	18 Easy 18	19 Medium 17
20 Medium 24	21 Medium 22	22 Easy 15	23 Medium 20	24 Easy 10	25 Medium 18	26 Easy 32
27 Medium 27	28 Easy 18	29 Easy 22	30 Easy 16	31 Expert 53

Average score: 27.13
July 2006
Sun	Mon	Tue	Wed	Thu	Fri	Sat
						1 Easy 23
2 Easy 24	3 Expert 33	4 Easy 26	5 Easy 16	6 Hard 34	7 Medium 18	8 Hard 35
9 Easy 28	10 Medium 25	11 Medium 23	12 Easy 20	13 Easy 21	14 Medium 22	15 Medium 33
16 Easy 19	17 Easy 15	18 Hard 34	19 Medium 24	20 Hard 32	21 Easy 38	22 Easy 22
23 Expert 59	24 Hard 26	25 Medium 34	26 Hard 20	27 Easy 17	28 Easy 22	29 Easy 19
30 Medium 28	31 Expert 51

Average score: 26.47
June 2006
Sun	Mon	Tue	Wed	Thu	Fri	Sat
				1 Easy 23	2 Medium 24	3 Medium 32
4 Hard 32	5 Easy 31	6 Hard 34	7 Easy 23	8 Hard 44	9 Hard 26	10 Easy 26
11 Medium 19	12 Hard 22	13 Medium 27	14 Medium 29	15 Medium 22	16 Medium 31	17 Easy 14
18 Easy 21	19 Easy 16	20 Medium 28	21 Hard 37	22 Hard 34	23 Easy 11	24 Medium 28
25 Medium 28	26 Medium 21	27 Expert 38	28 Easy 24	29 Medium 25	30 Medium 24

Average score: 25.32
May 2006
Sun	Mon	Tue	Wed	Thu	Fri	Sat
	1 Easy 33	2 Easy 24	3 Hard 31	4 Medium 26	5 Medium 24	6 Easy 18
7 Easy 24	8 Easy 12	9 Easy 13	10 Hard 24	11 Medium 24	12 Easy 25	13 Expert 32
14 Easy 14	15 Hard 39	16 Hard 38	17 Expert 48	18 Easy 11	19 Medium 23	20 Medium 23
21 Hard 38	22 Medium 31	23 Medium 26	24 Medium 27	25 Easy 13	26 Hard 22	27 Easy 26
28 Easy 17	29 Easy 18	30 Hard 28	31 Medium 33

Average score: 27.17
April 2006
Sun	Mon	Tue	Wed	Thu	Fri	Sat
						1 Easy 26
2 Medium 22	3 Hard 30	4 Easy 14	5 Hard 36	6 Easy 14	7 Medium 31	8 Medium 31
9 Medium 21	10 Hard 40	11 Medium 35	12 Expert 68	13 Medium 28	14 Easy 15	15 Medium 35
16 Easy 15	17 Easy 10	18 Medium 23	19 Hard 29	20 Easy 16	21 Easy 34	22 Medium 33
23