2
7
5
6
3
4
9
8
1
3
8
6
1
2
9
7
5
4
1
9
4
7
8
5
6
2
3
7
4
8
5
9
3
1
2
6
6
9
1
2
4
2
8
3
5
5
3
2
8
6
1
4
7
9
8
5
2
4
6
2
3
1
9
9
1
3
9
7
8
5
6
7
7
4
6
3
1
5
2
4
8
This Sudoku Puzzle has 21 steps and it is solved using Full House, Naked Single techniques.
Naked Single
Explanation
Full House
Explanation
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