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

This Sudoku Puzzle has 57 steps and it is solved using Naked Single, Hidden Single, Locked Pair, Full House, Locked Candidates Type 1 (Pointing), Naked Triple, Naked Pair techniques.

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

Solution Steps:

  1. Row 1 / Column 2 → 4 (Naked Single)
  2. Row 1 / Column 9 → 8 (Hidden Single)
  3. Row 6 / Column 8 → 8 (Hidden Single)
  4. Row 4 / Column 9 → 4 (Hidden Single)
  5. Row 8 / Column 2 → 8 (Hidden Single)
  6. Row 7 / Column 8 → 1 (Hidden Single)
  7. Row 4 / Column 7 → 3 (Hidden Single)
  8. Row 8 / Column 1 → 1 (Hidden Single)
  9. Row 5 / Column 2 → 1 (Hidden Single)
  10. Locked Pair: 5,9 in r1c13 => r1c4,r2c1<>9, r1c7,r3c1<>5
  11. Row 3 / Column 9 → 5 (Hidden Single)
  12. Row 3 / Column 1 → 3 (Hidden Single)
  13. Row 1 / Column 7 → 7 (Hidden Single)
  14. Row 1 / Column 4 → 1 (Naked Single)
  15. Row 3 / Column 2 → 2 (Hidden Single)
  16. Row 4 / Column 2 → 6 (Full House)
  17. Row 2 / Column 1 → 6 (Naked Single)
  18. Row 2 / Column 7 → 1 (Hidden Single)
  19. Row 4 / Column 6 → 1 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 6 in b5 => r6c7<>6
  21. Locked Candidates Type 1 (Pointing): 7 in b6 => r5c13<>7
  22. Naked Triple: 2,5,9 in r45c3,r5c1 => r6c13<>2, r6c13<>5
  23. Naked Pair: 4,7 in r67c1 => r9c1<>4, r9c1<>7
  24. Row 9 / Column 1 → 2 (Naked Single)
  25. Row 9 / Column 7 → 6 (Naked Single)
  26. Row 8 / Column 9 → 2 (Hidden Single)
  27. Row 2 / Column 9 → 3 (Naked Single)
  28. Row 2 / Column 8 → 2 (Full House)
  29. Row 7 / Column 9 → 7 (Naked Single)
  30. Row 5 / Column 8 → 7 (Naked Single)
  31. Row 9 / Column 8 → 3 (Full House)
  32. Row 9 / Column 9 → 9 (Full House)
  33. Row 5 / Column 9 → 6 (Full House)
  34. Row 7 / Column 1 → 4 (Naked Single)
  35. Row 6 / Column 1 → 7 (Naked Single)
  36. Row 7 / Column 4 → 5 (Naked Single)
  37. Row 7 / Column 6 → 3 (Full House)
  38. Row 9 / Column 3 → 7 (Naked Single)
  39. Row 8 / Column 3 → 3 (Full House)
  40. Row 9 / Column 6 → 4 (Full House)
  41. Row 6 / Column 3 → 4 (Naked Single)
  42. Row 4 / Column 4 → 2 (Naked Single)
  43. Row 4 / Column 3 → 5 (Full House)
  44. Row 2 / Column 6 → 9 (Naked Single)
  45. Row 2 / Column 4 → 4 (Full House)
  46. Row 6 / Column 4 → 6 (Naked Single)
  47. Row 6 / Column 6 → 5 (Full House)
  48. Row 6 / Column 7 → 2 (Full House)
  49. Row 5 / Column 7 → 5 (Full House)
  50. Row 1 / Column 3 → 9 (Naked Single)
  51. Row 1 / Column 1 → 5 (Full House)
  52. Row 5 / Column 1 → 9 (Full House)
  53. Row 5 / Column 3 → 2 (Full House)
  54. Row 8 / Column 6 → 7 (Naked Single)
  55. Row 3 / Column 6 → 6 (Full House)
  56. Row 3 / Column 4 → 7 (Full House)
  57. Row 8 / Column 4 → 9 (Full House)
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