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

This Sudoku Puzzle has 64 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), undefined, Locked Candidates Type 2 (Claiming), Naked Triple, Full House, Uniqueness Test 2 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 6 / Column 7 → 6 (Naked Single)
  2. Row 5 / Column 9 → 4 (Hidden Single)
  3. Row 3 / Column 8 → 2 (Hidden Single)
  4. Row 1 / Column 1 → 2 (Hidden Single)
  5. Row 5 / Column 1 → 7 (Hidden Single)
  6. Row 7 / Column 1 → 1 (Naked Single)
  7. Row 9 / Column 1 → 8 (Naked Single)
  8. Row 8 / Column 3 → 5 (Naked Single)
  9. Locked Candidates Type 1 (Pointing): 9 in b4 => r6c4<>9
  10. Locked Candidates Type 1 (Pointing): 9 in b6 => r4c6<>9
  11. Locked Candidates Type 1 (Pointing): 7 in b7 => r123c2<>7
  12. X-Wing: 3 r34 c36 => r2c3<>3
  13. W-Wing: 8/7 in r2c3,r3c9 connected by 7 in r23c5 => r3c23<>8
  14. Row 3 / Column 2 → 6 (Naked Single)
  15. W-Wing: 8/3 in r2c4,r4c3 connected by 3 in r3c36 => r2c3<>8
  16. Row 2 / Column 3 → 7 (Naked Single)
  17. Row 3 / Column 5 → 7 (Hidden Single)
  18. Row 3 / Column 9 → 8 (Naked Single)
  19. Row 8 / Column 8 → 8 (Hidden Single)
  20. Locked Candidates Type 2 (Claiming): 7 in c7 => r79c8,r9c9<>7
  21. XY-Wing: 4/6/2 in r7c48,r8c7 => r7c7,r8c5<>2
  22. Row 8 / Column 7 → 2 (Hidden Single)
  23. Locked Candidates Type 2 (Claiming): 4 in r8 => r7c5,r9c6<>4
  24. Naked Triple: 1,4,8 in r268c5 => r4c5<>8
  25. Row 4 / Column 5 → 6 (Naked Single)
  26. Row 4 / Column 6 → 3 (Naked Single)
  27. Row 3 / Column 6 → 1 (Naked Single)
  28. Row 3 / Column 3 → 3 (Full House)
  29. Row 4 / Column 3 → 8 (Naked Single)
  30. Row 1 / Column 3 → 1 (Full House)
  31. Row 2 / Column 1 → 9 (Naked Single)
  32. Row 6 / Column 1 → 3 (Full House)
  33. Row 6 / Column 2 → 9 (Full House)
  34. Row 2 / Column 4 → 3 (Hidden Single)
  35. Uniqueness Test 2: 4/7 in r7c27,r9c27 => r2c7,r9c9<>5
  36. Row 2 / Column 7 → 4 (Naked Single)
  37. Row 1 / Column 8 → 7 (Naked Single)
  38. Row 1 / Column 9 → 5 (Full House)
  39. Row 2 / Column 5 → 8 (Naked Single)
  40. Row 2 / Column 2 → 5 (Full House)
  41. Row 1 / Column 2 → 8 (Full House)
  42. Row 4 / Column 8 → 9 (Naked Single)
  43. Row 4 / Column 9 → 7 (Full House)
  44. Row 1 / Column 4 → 6 (Naked Single)
  45. Row 1 / Column 6 → 4 (Full House)
  46. Row 6 / Column 5 → 1 (Naked Single)
  47. Row 6 / Column 4 → 8 (Full House)
  48. Row 7 / Column 4 → 2 (Naked Single)
  49. Row 8 / Column 6 → 9 (Naked Single)
  50. Row 8 / Column 5 → 4 (Naked Single)
  51. Row 8 / Column 9 → 1 (Full House)
  52. Row 9 / Column 9 → 9 (Full House)
  53. Row 5 / Column 4 → 9 (Naked Single)
  54. Row 9 / Column 4 → 1 (Full House)
  55. Row 7 / Column 5 → 5 (Naked Single)
  56. Row 5 / Column 5 → 2 (Full House)
  57. Row 5 / Column 6 → 5 (Full House)
  58. Row 9 / Column 6 → 6 (Full House)
  59. Row 7 / Column 7 → 7 (Naked Single)
  60. Row 9 / Column 7 → 5 (Full House)
  61. Row 9 / Column 8 → 4 (Naked Single)
  62. Row 7 / Column 8 → 6 (Full House)
  63. Row 7 / Column 2 → 4 (Full House)
  64. Row 9 / Column 2 → 7 (Full House)
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