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How to solve Videos Forum Timed Rankings Print   Hide solution 9 Nov 2012
Easy:
4×4
6×6
Sudoku
Medium:
4×4
6×6
Killer
Sudoku
Difficult:
4×4
6×6
9×9
10×10
Killer
Extra
Difficult Killer Sudoku, Rating: ★★★★★      Solved 1088 times

One of the World's Hardest Killer Sudokus
can you solve it?
abcdefghi
1 
15
8
 
6
19
3
 
9
16
7
 
5
8
2
 
1
19
4
Clear cell
Bold cell
Toggle pencil mode
Hide buttons
Change buttons position
Undo
2 
 
1
15
2
 
7
4
3
 
4
18
6
 
9
 
5
 
8
3 
7
4
 
5
16
9
 
1
16
8
 
2
 
3
12
6
 
7
4 
 
3
 
8
 
5
 
2
 
6
17
1
 
7
 
4
17
9
5 
17
7
10
4
 
6
20
8
 
5
 
9
7
1
 
2
 
3
6 
 
9
 
1
6
2
 
7
9
3
7
4
 
6
26
8
 
5
7 
23
2
 
9
 
4
 
5
 
1
 
3
12
8
 
7
 
6
8 
 
5
 
7
26
1
 
6
 
9
 
8
 
4
 
3
 
2
9 
21
6
 
3
 
8
 
4
 
2
12
7
 
5
10
9
 
1
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total
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