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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, Naked Triple, Full House, undefined techniques.

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

Solution Steps:

  1. Row 5 / Column 2 → 5 (Hidden Single)
  2. Row 6 / Column 7 → 5 (Hidden Single)
  3. Row 8 / Column 5 → 3 (Hidden Single)
  4. Row 2 / Column 9 → 8 (Hidden Single)
  5. Row 5 / Column 1 → 2 (Hidden Single)
  6. Row 4 / Column 6 → 3 (Hidden Single)
  7. Row 8 / Column 9 → 2 (Hidden Single)
  8. Locked Triple: 1,6,8 in r456c5 => r12c5<>1, r129c5,r5c46<>6, r1c5,r5c4<>8
  9. Row 1 / Column 5 → 2 (Naked Single)
  10. Row 3 / Column 2 → 2 (Hidden Single)
  11. Row 2 / Column 7 → 2 (Hidden Single)
  12. Row 9 / Column 4 → 2 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 7 in b5 => r5c38<>7
  14. Row 1 / Column 8 → 7 (Hidden Single)
  15. Row 4 / Column 7 → 7 (Hidden Single)
  16. Row 5 / Column 8 → 4 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 9 in b5 => r5c3<>9
  18. Locked Candidates Type 1 (Pointing): 1 in b7 => r46c2<>1
  19. Naked Pair: 1,6 in r1c67 => r1c24<>6
  20. Naked Triple: 4,6,8 in r4c12,r5c3 => r4c3<>4, r46c3,r6c12<>6, r4c3<>8
  21. Row 6 / Column 2 → 3 (Naked Single)
  22. Row 1 / Column 2 → 8 (Naked Single)
  23. Row 6 / Column 1 → 7 (Naked Single)
  24. Row 1 / Column 4 → 3 (Naked Single)
  25. Row 2 / Column 1 → 3 (Hidden Single)
  26. Row 3 / Column 4 → 8 (Hidden Single)
  27. Row 5 / Column 3 → 8 (Hidden Single)
  28. Row 5 / Column 5 → 6 (Naked Single)
  29. Row 6 / Column 5 → 1 (Naked Single)
  30. Row 4 / Column 5 → 8 (Naked Single)
  31. Row 6 / Column 3 → 9 (Naked Single)
  32. Row 6 / Column 9 → 6 (Full House)
  33. Row 4 / Column 9 → 9 (Full House)
  34. Row 4 / Column 3 → 1 (Naked Single)
  35. Row 7 / Column 7 → 8 (Hidden Single)
  36. Row 9 / Column 1 → 8 (Hidden Single)
  37. Row 8 / Column 3 → 7 (Hidden Single)
  38. Row 3 / Column 8 → 3 (Hidden Single)
  39. W-Wing: 6/1 in r1c6,r7c8 connected by 1 in r2c68 => r7c6<>6
  40. W-Wing: 9/6 in r2c4,r3c7 connected by 6 in r1c67 => r2c8,r3c6<>9
  41. Row 9 / Column 8 → 9 (Hidden Single)
  42. Row 3 / Column 7 → 9 (Hidden Single)
  43. X-Wing: 6 c48 r27 => r2c36,r7c2<>6
  44. Row 2 / Column 3 → 4 (Naked Single)
  45. Row 3 / Column 3 → 6 (Full House)
  46. Row 3 / Column 6 → 4 (Full House)
  47. Row 2 / Column 5 → 5 (Naked Single)
  48. Row 9 / Column 5 → 4 (Full House)
  49. Row 7 / Column 6 → 7 (Naked Single)
  50. Row 5 / Column 6 → 9 (Naked Single)
  51. Row 5 / Column 4 → 7 (Full House)
  52. Row 7 / Column 4 → 6 (Naked Single)
  53. Row 2 / Column 4 → 9 (Full House)
  54. Row 9 / Column 6 → 5 (Full House)
  55. Row 2 / Column 6 → 1 (Naked Single)
  56. Row 1 / Column 6 → 6 (Full House)
  57. Row 2 / Column 8 → 6 (Full House)
  58. Row 7 / Column 8 → 1 (Full House)
  59. Row 1 / Column 7 → 1 (Full House)
  60. Row 7 / Column 2 → 4 (Full House)
  61. Row 9 / Column 7 → 6 (Naked Single)
  62. Row 8 / Column 7 → 4 (Full House)
  63. Row 8 / Column 1 → 6 (Full House)
  64. Row 9 / Column 2 → 1 (Full House)
  65. Row 4 / Column 2 → 6 (Full House)
  66. Row 4 / Column 1 → 4 (Full House)
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