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

This Sudoku Puzzle has 69 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Skyscraper, Full House, undefined techniques.

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

Solution Steps:

  1. Row 2 / Column 1 → 7 (Naked Single)
  2. Row 8 / Column 1 → 2 (Naked Single)
  3. Row 2 / Column 6 → 5 (Hidden Single)
  4. Row 1 / Column 4 → 7 (Hidden Single)
  5. Row 4 / Column 7 → 4 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 6 in b1 => r45c2<>6
  7. Locked Candidates Type 1 (Pointing): 8 in b3 => r2c5<>8
  8. Locked Candidates Type 1 (Pointing): 5 in b6 => r7c9<>5
  9. Locked Candidates Type 1 (Pointing): 5 in b7 => r4c2<>5
  10. Locked Candidates Type 2 (Claiming): 8 in c5 => r7c46,r89c6,r9c4<>8
  11. Row 7 / Column 9 → 8 (Hidden Single)
  12. Row 2 / Column 7 → 8 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 2 in b9 => r5c8<>2
  14. Naked Triple: 1,6,9 in r8c689 => r8c57<>1, r8c57<>6, r8c57<>9
  15. Row 8 / Column 7 → 7 (Naked Single)
  16. Locked Candidates Type 2 (Claiming): 1 in c7 => r456c9,r5c8<>1
  17. Naked Triple: 1,6,9 in r8c89,r9c7 => r7c8<>1, r9c8<>6, r9c8<>9
  18. Locked Candidates Type 1 (Pointing): 1 in b9 => r8c6<>1
  19. Skyscraper: 4 in r1c5,r7c4 (connected by r17c2) => r3c4,r8c5<>4
  20. Row 8 / Column 5 → 8 (Naked Single)
  21. Row 8 / Column 3 → 4 (Naked Single)
  22. Row 7 / Column 2 → 5 (Naked Single)
  23. Row 7 / Column 8 → 2 (Naked Single)
  24. Row 9 / Column 2 → 7 (Naked Single)
  25. Row 9 / Column 3 → 8 (Full House)
  26. Row 7 / Column 6 → 1 (Naked Single)
  27. Row 7 / Column 4 → 4 (Full House)
  28. Row 9 / Column 8 → 5 (Naked Single)
  29. Row 1 / Column 5 → 4 (Hidden Single)
  30. Row 3 / Column 2 → 4 (Hidden Single)
  31. Row 9 / Column 6 → 2 (Hidden Single)
  32. Row 5 / Column 3 → 7 (Hidden Single)
  33. Row 3 / Column 8 → 6 (Hidden Single)
  34. Row 1 / Column 2 → 6 (Hidden Single)
  35. Row 5 / Column 9 → 2 (Hidden Single)
  36. Row 4 / Column 3 → 2 (Hidden Single)
  37. Row 6 / Column 3 → 3 (Hidden Single)
  38. Locked Candidates Type 2 (Claiming): 1 in r1 => r2c9<>1
  39. X-Wing: 3 c68 r15 => r1c9,r5c4<>3
  40. Skyscraper: 6 in r5c7,r8c9 (connected by r58c6) => r46c9,r9c7<>6
  41. Row 9 / Column 7 → 9 (Naked Single)
  42. Row 8 / Column 8 → 1 (Naked Single)
  43. Row 8 / Column 9 → 6 (Full House)
  44. Row 8 / Column 6 → 9 (Full House)
  45. Row 9 / Column 4 → 3 (Naked Single)
  46. Row 9 / Column 5 → 6 (Full House)
  47. Row 1 / Column 6 → 3 (Naked Single)
  48. Row 3 / Column 6 → 8 (Naked Single)
  49. Row 5 / Column 6 → 6 (Full House)
  50. Row 1 / Column 8 → 9 (Naked Single)
  51. Row 1 / Column 9 → 1 (Full House)
  52. Row 2 / Column 9 → 3 (Full House)
  53. Row 5 / Column 8 → 3 (Full House)
  54. Row 5 / Column 7 → 1 (Naked Single)
  55. Row 6 / Column 7 → 6 (Full House)
  56. Row 5 / Column 2 → 9 (Naked Single)
  57. Row 4 / Column 2 → 1 (Full House)
  58. Row 5 / Column 4 → 8 (Full House)
  59. Row 6 / Column 1 → 5 (Naked Single)
  60. Row 4 / Column 1 → 6 (Full House)
  61. Row 4 / Column 4 → 9 (Naked Single)
  62. Row 3 / Column 4 → 1 (Full House)
  63. Row 2 / Column 5 → 9 (Full House)
  64. Row 3 / Column 3 → 9 (Full House)
  65. Row 2 / Column 3 → 1 (Full House)
  66. Row 6 / Column 9 → 9 (Naked Single)
  67. Row 4 / Column 9 → 5 (Full House)
  68. Row 4 / Column 5 → 3 (Full House)
  69. Row 6 / Column 5 → 1 (Full House)
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