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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
5512
279
0 (Hard)
5511
284
0 (Very hard)
5510
291
0 (Very hard)
5509
288
0 (Very hard)
5508
289
0 (Hard)
5507
288
0 (Hard)
5506
287
0 (Very hard)
5505
278
0 (Hard)
5504
285
0 (Hard)
5503
280
0 (Very hard)