4
7
6
2
5
1
6
7
5
4
3
2
5
1
8
4
7
6
9
1
7
5
8
2
3
4
9
6
3
9
8
6
7
4
5
1
2
6
4
2
9
1
5
3
7
8
9
8
4
5
7
6
2
7
5
6
4
1
2
3
4
8
6
5
9
7
This Sudoku Puzzle has 15 steps and it is solved using Full House, Naked Single techniques.
Naked Single
Explanation
Full House
Explanation
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