3
9
5
6
7
1
1
7
2
3
6
9
4
8
6
1
2
3
7
5
8
3
2
4
5
9
7
1
6
4
6
1
7
2
3
9
5
9
7
8
6
1
2
4
3
6
2
3
4
1
7
1
9
7
3
6
7
5
6
3
1
This Sudoku Puzzle has 20 steps and it is solved using Full House, Naked Single techniques.
Naked Single
Explanation
Full House
Explanation
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