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

This Sudoku Puzzle has 51 steps and it is solved using Locked Pair, Locked Triple, Naked Triple, Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Skyscraper techniques.

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

Solution Steps:

  1. Locked Pair: 3,7 in r3c13 => r1c13,r3c79<>3
  2. Locked Triple: 3,4,5 in r456c8 => r2c8,r56c7,r6c9<>3
  3. Naked Triple: 1,6,9 in r356c7 => r89c7<>1
  4. Row 8 / Column 6 → 1 (Hidden Single)
  5. Row 5 / Column 6 → 3 (Naked Single)
  6. Row 1 / Column 6 → 6 (Naked Single)
  7. Row 1 / Column 4 → 3 (Full House)
  8. Row 5 / Column 8 → 4 (Naked Single)
  9. Row 7 / Column 4 → 6 (Hidden Single)
  10. Row 4 / Column 4 → 4 (Hidden Single)
  11. Row 4 / Column 1 → 9 (Hidden Single)
  12. Locked Candidates Type 1 (Pointing): 2 in b8 => r7c3<>2
  13. Locked Candidates Type 1 (Pointing): 2 in b7 => r9c7<>2
  14. Locked Candidates Type 1 (Pointing): 1 in b9 => r6c9<>1
  15. Skyscraper: 7 in r7c5,r9c2 (connected by r6c25) => r7c3<>7
  16. Row 7 / Column 5 → 7 (Hidden Single)
  17. Row 8 / Column 4 → 8 (Naked Single)
  18. Row 7 / Column 6 → 2 (Full House)
  19. Row 8 / Column 8 → 2 (Naked Single)
  20. Row 8 / Column 7 → 7 (Full House)
  21. Row 4 / Column 6 → 5 (Naked Single)
  22. Row 6 / Column 6 → 8 (Full House)
  23. Row 2 / Column 8 → 8 (Naked Single)
  24. Row 9 / Column 7 → 3 (Naked Single)
  25. Row 4 / Column 8 → 3 (Naked Single)
  26. Row 6 / Column 8 → 5 (Full House)
  27. Row 2 / Column 9 → 3 (Naked Single)
  28. Row 2 / Column 7 → 2 (Full House)
  29. Row 3 / Column 3 → 3 (Hidden Single)
  30. Row 3 / Column 1 → 7 (Naked Single)
  31. Row 5 / Column 1 → 1 (Naked Single)
  32. Row 4 / Column 3 → 2 (Naked Single)
  33. Row 4 / Column 5 → 1 (Full House)
  34. Row 6 / Column 5 → 2 (Full House)
  35. Row 5 / Column 7 → 9 (Naked Single)
  36. Row 5 / Column 4 → 7 (Full House)
  37. Row 6 / Column 4 → 9 (Full House)
  38. Row 1 / Column 3 → 8 (Naked Single)
  39. Row 1 / Column 1 → 2 (Full House)
  40. Row 6 / Column 1 → 3 (Naked Single)
  41. Row 6 / Column 2 → 7 (Full House)
  42. Row 9 / Column 1 → 8 (Full House)
  43. Row 9 / Column 2 → 2 (Full House)
  44. Row 3 / Column 7 → 6 (Naked Single)
  45. Row 3 / Column 9 → 9 (Full House)
  46. Row 6 / Column 7 → 1 (Full House)
  47. Row 6 / Column 9 → 6 (Full House)
  48. Row 7 / Column 3 → 1 (Naked Single)
  49. Row 7 / Column 9 → 8 (Full House)
  50. Row 9 / Column 9 → 1 (Full House)
  51. Row 9 / Column 3 → 7 (Full House)
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