7
1
8
4
9
3
6
4
3
1
6
8
6
3
4
1
9
7
1
4
6
8
6
9
4
4
6
9
2
8
3
5
7
6
4
9
1
6
9
4
1
8
2
3
1
9
4
3
6
2
8

This Sudoku Puzzle has 33 steps and it is solved using Naked Triple, Skyscraper, Hidden Single, Naked Single, Full House techniques.

Naked Single Explanation
Hidden Single Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Naked Triple: 2,5,7 in r46c4,r5c5 => r456c6<>5, r56c6<>7
  2. Skyscraper: 2 in r2c9,r3c5 (connected by r5c59) => r2c4<>2
  3. Row 3 / Column 5 → 2 (Hidden Single)
  4. Row 3 / Column 3 → 5 (Naked Single)
  5. Row 1 / Column 3 → 2 (Full House)
  6. Skyscraper: 7 in r2c4,r3c8 (connected by r6c48) => r2c79,r3c6<>7
  7. Row 3 / Column 6 → 9 (Naked Single)
  8. Row 3 / Column 8 → 7 (Full House)
  9. Row 1 / Column 6 → 5 (Naked Single)
  10. Row 2 / Column 4 → 7 (Full House)
  11. Row 6 / Column 8 → 5 (Naked Single)
  12. Row 1 / Column 7 → 8 (Naked Single)
  13. Row 1 / Column 8 → 9 (Full House)
  14. Row 4 / Column 8 → 8 (Full House)
  15. Row 9 / Column 6 → 7 (Naked Single)
  16. Row 9 / Column 5 → 5 (Full House)
  17. Row 5 / Column 5 → 7 (Full House)
  18. Row 6 / Column 4 → 2 (Naked Single)
  19. Row 4 / Column 4 → 5 (Full House)
  20. Row 5 / Column 9 → 2 (Naked Single)
  21. Row 6 / Column 2 → 3 (Naked Single)
  22. Row 2 / Column 9 → 5 (Naked Single)
  23. Row 2 / Column 7 → 2 (Full House)
  24. Row 7 / Column 9 → 7 (Full House)
  25. Row 7 / Column 7 → 5 (Full House)
  26. Row 5 / Column 7 → 3 (Naked Single)
  27. Row 4 / Column 2 → 2 (Naked Single)
  28. Row 5 / Column 2 → 5 (Full House)
  29. Row 5 / Column 6 → 8 (Full House)
  30. Row 6 / Column 6 → 1 (Naked Single)
  31. Row 4 / Column 6 → 3 (Full House)
  32. Row 4 / Column 7 → 1 (Full House)
  33. Row 6 / Column 7 → 7 (Full House)
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