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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Skyscraper, Naked Single, Full House 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 5 / Column 1 → 2 (Hidden Single)
  2. Row 2 / Column 4 → 7 (Hidden Single)
  3. Row 1 / Column 2 → 7 (Hidden Single)
  4. Row 8 / Column 8 → 7 (Hidden Single)
  5. Row 9 / Column 3 → 6 (Hidden Single)
  6. Row 1 / Column 6 → 5 (Hidden Single)
  7. Row 8 / Column 3 → 5 (Hidden Single)
  8. Row 6 / Column 1 → 6 (Hidden Single)
  9. Row 5 / Column 6 → 7 (Hidden Single)
  10. Row 6 / Column 9 → 5 (Hidden Single)
  11. Row 3 / Column 6 → 9 (Hidden Single)
  12. Row 5 / Column 5 → 9 (Hidden Single)
  13. Row 1 / Column 3 → 9 (Hidden Single)
  14. Row 9 / Column 6 → 1 (Hidden Single)
  15. Row 9 / Column 9 → 9 (Hidden Single)
  16. Row 8 / Column 9 → 1 (Hidden Single)
  17. Row 7 / Column 2 → 9 (Hidden Single)
  18. Row 5 / Column 9 → 3 (Hidden Single)
  19. Locked Candidates Type 1 (Pointing): 4 in b4 => r3c3<>4
  20. Locked Candidates Type 1 (Pointing): 1 in b5 => r13c4<>1
  21. Locked Candidates Type 2 (Claiming): 4 in r8 => r7c1,r9c2<>4
  22. Locked Candidates Type 2 (Claiming): 2 in c9 => r1c7,r3c8<>2
  23. Locked Candidates Type 2 (Claiming): 4 in c9 => r1c7,r3c8<>4
  24. Naked Pair: 1,6 in r1c7,r3c8 => r2c78<>1
  25. Naked Pair: 3,8 in r7c16 => r7c47<>3, r7c4<>8
  26. Row 9 / Column 7 → 3 (Hidden Single)
  27. Skyscraper: 3 in r2c5,r7c6 (connected by r27c1) => r8c5<>3
  28. Row 8 / Column 5 → 2 (Naked Single)
  29. Row 7 / Column 4 → 4 (Naked Single)
  30. Row 9 / Column 4 → 8 (Naked Single)
  31. Row 7 / Column 6 → 3 (Full House)
  32. Row 4 / Column 6 → 8 (Full House)
  33. Row 9 / Column 2 → 2 (Naked Single)
  34. Row 9 / Column 8 → 4 (Full House)
  35. Row 7 / Column 1 → 8 (Naked Single)
  36. Row 1 / Column 5 → 8 (Hidden Single)
  37. Skyscraper: 3 in r2c1,r4c3 (connected by r24c5) => r3c3<>3
  38. Row 3 / Column 3 → 8 (Naked Single)
  39. Row 5 / Column 3 → 4 (Naked Single)
  40. Row 4 / Column 3 → 3 (Full House)
  41. Row 6 / Column 2 → 8 (Full House)
  42. Row 4 / Column 5 → 6 (Naked Single)
  43. Row 4 / Column 8 → 2 (Naked Single)
  44. Row 4 / Column 7 → 4 (Full House)
  45. Row 5 / Column 4 → 1 (Naked Single)
  46. Row 6 / Column 4 → 3 (Full House)
  47. Row 7 / Column 8 → 5 (Naked Single)
  48. Row 7 / Column 7 → 2 (Full House)
  49. Row 5 / Column 7 → 6 (Naked Single)
  50. Row 5 / Column 8 → 8 (Full House)
  51. Row 2 / Column 8 → 9 (Naked Single)
  52. Row 1 / Column 7 → 1 (Naked Single)
  53. Row 2 / Column 7 → 5 (Naked Single)
  54. Row 6 / Column 7 → 9 (Full House)
  55. Row 6 / Column 8 → 1 (Full House)
  56. Row 3 / Column 8 → 6 (Full House)
  57. Row 1 / Column 1 → 4 (Naked Single)
  58. Row 3 / Column 4 → 2 (Naked Single)
  59. Row 1 / Column 4 → 6 (Full House)
  60. Row 1 / Column 9 → 2 (Full House)
  61. Row 3 / Column 9 → 4 (Full House)
  62. Row 3 / Column 2 → 3 (Naked Single)
  63. Row 2 / Column 1 → 1 (Full House)
  64. Row 8 / Column 1 → 3 (Full House)
  65. Row 3 / Column 5 → 1 (Full House)
  66. Row 8 / Column 2 → 4 (Full House)
  67. Row 2 / Column 5 → 3 (Full House)
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