Killer Sudoku
Easy
Medium
Hard
Expert
Diabolical
21
6
21
10
13
6
9
4
5
6
15
14
1
17
15
8
17
3
18
1
8
14
3
12
1
9
11
2
18
4
9
20
10
7
3
19
6
8
5
3
7
16
1
2
3
4
5
6
7
8
9
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Verified puzzle
· Difficulty:
Medium
· Cages:
42
· Solver steps:
299
· Search depth:
0
· Solutions:
1