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Solution Table
Solution table
Reducing methods
Conventions
Normal sudokus
2x2
2x3
2x4
3x3
2x5
3x4
3x5
4x4
5x5
6x6
7x7
8x8
9x9
Irregular boxsizes
4
6
8
9
10
12
16
Diagonal
2x2
2x3
2x4
3x3
2x5
4x4
5x5
6x6
Disjoint groups
2x2
2x3
2x4
3x3
4x4
Irregular & Disjoint groups
4
6
9
No boxes
6
9
16
25
30
36
49
Odd/Even
2x2
2x3
3x3
4x4
Odd/Even irregular
4
6
9
Top 10 most difficult in DB
Idnr
Starting numbers
Difficulty
6903541
21
17199 (Super hard)
6903956
19
15566 (Super hard)
6905135
19
14570 (Super hard)
6900935
22
13070 (Super hard)
6900241
19
12709 (Super hard)
6903693
20
11703 (Super hard)
6899713
21
11105 (Super hard)
6909833
20
10568 (Super hard)
6911141
21
10226 (Super hard)
6908321
22
8706 (Super hard)