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

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

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

Solution Steps:

  1. Row 2 / Column 2 → 4 (Hidden Single)
  2. Row 6 / Column 2 → 1 (Hidden Single)
  3. Row 5 / Column 7 → 4 (Hidden Single)
  4. Row 2 / Column 3 → 5 (Hidden Single)
  5. Row 3 / Column 7 → 5 (Hidden Single)
  6. Row 8 / Column 2 → 5 (Hidden Single)
  7. Row 1 / Column 3 → 7 (Hidden Single)
  8. Locked Candidates Type 1 (Pointing): 1 in b3 => r79c9<>1
  9. Naked Triple: 3,6,8 in r245c8 => r68c8<>3, r67c8<>8, r78c8<>6
  10. Row 6 / Column 8 → 9 (Naked Single)
  11. Locked Candidates Type 1 (Pointing): 3 in b9 => r6c7<>3
  12. Row 6 / Column 6 → 3 (Hidden Single)
  13. Naked Pair: 1,6 in r18c6 => r27c6<>6, r7c6<>1
  14. Naked Triple: 1,6,9 in r1c679 => r1c1<>6, r1c1<>9, r1c5<>1
  15. Row 3 / Column 1 → 9 (Hidden Single)
  16. Locked Candidates Type 1 (Pointing): 6 in b1 => r3c49<>6
  17. X-Wing: 2 c24 r34 => r3c35,r4c15<>2
  18. Skyscraper: 8 in r3c9,r6c7 (connected by r36c4) => r45c9<>8
  19. W-Wing: 9/6 in r1c7,r8c4 connected by 6 in r2c48 => r8c7<>9
  20. Row 8 / Column 4 → 9 (Hidden Single)
  21. W-Wing: 3/6 in r8c7,r9c2 connected by 6 in r8c6,r9c4 => r8c3,r9c7<>3
  22. Row 8 / Column 7 → 3 (Hidden Single)
  23. Hidden Rectangle: 6/9 in r1c79,r9c79 => r9c9<>6
  24. Sue de Coq: r23c4 - {2678} (r6c4 - {78}, r1c56,r3c5 - {1236}) => r49c4<>7, r4c4<>8
  25. XY-Chain: 6 6- r2c8 -8- r3c9 -1- r3c5 -3- r1c5 -2- r5c5 -5- r5c9 -6 => r1c9,r45c8<>6
  26. Row 2 / Column 8 → 6 (Hidden Single)
  27. Row 1 / Column 7 → 9 (Naked Single)
  28. Row 1 / Column 9 → 1 (Naked Single)
  29. Row 3 / Column 9 → 8 (Full House)
  30. Row 1 / Column 6 → 6 (Naked Single)
  31. Row 3 / Column 4 → 2 (Naked Single)
  32. Row 8 / Column 6 → 1 (Naked Single)
  33. Row 1 / Column 5 → 3 (Naked Single)
  34. Row 1 / Column 1 → 2 (Full House)
  35. Row 4 / Column 4 → 4 (Naked Single)
  36. Row 8 / Column 8 → 2 (Naked Single)
  37. Row 8 / Column 3 → 6 (Full House)
  38. Row 3 / Column 5 → 1 (Naked Single)
  39. Row 9 / Column 4 → 6 (Naked Single)
  40. Row 7 / Column 8 → 1 (Naked Single)
  41. Row 3 / Column 3 → 3 (Naked Single)
  42. Row 3 / Column 2 → 6 (Full House)
  43. Row 9 / Column 2 → 3 (Naked Single)
  44. Row 4 / Column 2 → 2 (Full House)
  45. Row 5 / Column 3 → 8 (Naked Single)
  46. Row 5 / Column 8 → 3 (Naked Single)
  47. Row 4 / Column 8 → 8 (Full House)
  48. Row 7 / Column 3 → 2 (Naked Single)
  49. Row 9 / Column 3 → 1 (Full House)
  50. Row 5 / Column 1 → 6 (Naked Single)
  51. Row 4 / Column 1 → 3 (Full House)
  52. Row 6 / Column 7 → 7 (Naked Single)
  53. Row 6 / Column 4 → 8 (Full House)
  54. Row 2 / Column 4 → 7 (Full House)
  55. Row 2 / Column 6 → 8 (Full House)
  56. Row 5 / Column 9 → 5 (Naked Single)
  57. Row 4 / Column 9 → 6 (Full House)
  58. Row 5 / Column 5 → 2 (Full House)
  59. Row 9 / Column 7 → 8 (Naked Single)
  60. Row 7 / Column 7 → 6 (Full House)
  61. Row 7 / Column 9 → 7 (Naked Single)
  62. Row 9 / Column 9 → 9 (Full House)
  63. Row 9 / Column 1 → 4 (Naked Single)
  64. Row 7 / Column 1 → 8 (Full House)
  65. Row 9 / Column 5 → 7 (Full House)
  66. Row 7 / Column 6 → 5 (Naked Single)
  67. Row 4 / Column 6 → 7 (Full House)
  68. Row 4 / Column 5 → 5 (Full House)
  69. Row 7 / Column 5 → 4 (Full House)
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