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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Skyscraper, Naked Single, undefined, Full House, Bivalue Universal Grave + 1 techniques.

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

Solution Steps:

  1. Row 3 / Column 7 → 7 (Hidden Single)
  2. Row 5 / Column 5 → 7 (Hidden Single)
  3. Row 6 / Column 8 → 2 (Hidden Single)
  4. Row 8 / Column 1 → 9 (Hidden Single)
  5. Row 3 / Column 4 → 2 (Hidden Single)
  6. Row 6 / Column 6 → 8 (Hidden Single)
  7. Row 2 / Column 5 → 9 (Hidden Single)
  8. Row 4 / Column 4 → 9 (Hidden Single)
  9. Row 2 / Column 7 → 2 (Hidden Single)
  10. Row 7 / Column 6 → 2 (Hidden Single)
  11. Row 7 / Column 2 → 7 (Hidden Single)
  12. Row 8 / Column 6 → 7 (Hidden Single)
  13. Row 9 / Column 8 → 7 (Hidden Single)
  14. Row 7 / Column 1 → 8 (Hidden Single)
  15. Row 2 / Column 2 → 8 (Hidden Single)
  16. Row 5 / Column 8 → 8 (Hidden Single)
  17. Row 2 / Column 4 → 6 (Hidden Single)
  18. Row 1 / Column 3 → 6 (Hidden Single)
  19. Row 8 / Column 2 → 6 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 3 in b1 => r9c1<>3
  21. Locked Candidates Type 1 (Pointing): 3 in b4 => r9c2<>3
  22. Skyscraper: 5 in r6c2,r8c3 (connected by r68c4) => r5c3,r9c2<>5
  23. Row 9 / Column 2 → 1 (Naked Single)
  24. Locked Candidates Type 1 (Pointing): 1 in b4 => r5c79<>1
  25. Row 5 / Column 9 → 9 (Naked Single)
  26. Row 5 / Column 7 → 5 (Naked Single)
  27. Row 7 / Column 7 → 9 (Hidden Single)
  28. Skyscraper: 1 in r6c9,r8c8 (connected by r68c4) => r4c8,r7c9<>1
  29. Row 8 / Column 8 → 1 (Hidden Single)
  30. W-Wing: 3/4 in r2c8,r9c7 connected by 4 in r4c78 => r1c7<>3
  31. W-Wing: 4/1 in r1c7,r2c6 connected by 1 in r4c67 => r1c6,r2c8<>4
  32. Row 2 / Column 8 → 3 (Naked Single)
  33. Row 4 / Column 8 → 4 (Full House)
  34. Row 2 / Column 6 → 4 (Hidden Single)
  35. Row 2 / Column 1 → 1 (Full House)
  36. Row 5 / Column 1 → 2 (Naked Single)
  37. Row 5 / Column 3 → 1 (Full House)
  38. Row 1 / Column 1 → 3 (Hidden Single)
  39. Row 9 / Column 3 → 2 (Hidden Single)
  40. Row 7 / Column 3 → 3 (Hidden Single)
  41. Locked Candidates Type 1 (Pointing): 4 in b1 => r3c9<>4
  42. Locked Candidates Type 1 (Pointing): 5 in b1 => r3c5<>5
  43. X-Wing: 1 c67 r14 => r1c59<>1
  44. Bivalue Universal Grave + 1 => r9c9<>3, r9c9<>6
  45. Row 9 / Column 9 → 4 (Naked Single)
  46. Row 1 / Column 9 → 8 (Naked Single)
  47. Row 7 / Column 9 → 6 (Naked Single)
  48. Row 9 / Column 7 → 3 (Full House)
  49. Row 9 / Column 1 → 5 (Naked Single)
  50. Row 3 / Column 1 → 4 (Full House)
  51. Row 8 / Column 3 → 4 (Full House)
  52. Row 9 / Column 5 → 6 (Full House)
  53. Row 3 / Column 3 → 5 (Full House)
  54. Row 8 / Column 4 → 5 (Full House)
  55. Row 1 / Column 5 → 5 (Naked Single)
  56. Row 3 / Column 9 → 1 (Naked Single)
  57. Row 1 / Column 7 → 4 (Full House)
  58. Row 4 / Column 7 → 1 (Full House)
  59. Row 1 / Column 6 → 1 (Full House)
  60. Row 3 / Column 5 → 8 (Full House)
  61. Row 7 / Column 5 → 1 (Full House)
  62. Row 6 / Column 9 → 3 (Full House)
  63. Row 4 / Column 6 → 5 (Full House)
  64. Row 6 / Column 4 → 1 (Full House)
  65. Row 7 / Column 4 → 4 (Full House)
  66. Row 6 / Column 2 → 5 (Full House)
  67. Row 4 / Column 2 → 3 (Full House)
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