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

This Sudoku Puzzle has 70 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, Naked Single, Hidden Pair, Empty Rectangle, undefined, Uniqueness Test 1, Full House techniques.

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

Solution Steps:

  1. Row 2 / Column 9 → 3 (Hidden Single)
  2. Row 1 / Column 2 → 2 (Hidden Single)
  3. Row 8 / Column 1 → 6 (Hidden Single)
  4. Row 3 / Column 2 → 8 (Hidden Single)
  5. Row 8 / Column 2 → 3 (Hidden Single)
  6. Row 3 / Column 1 → 9 (Hidden Single)
  7. Row 4 / Column 1 → 3 (Hidden Single)
  8. Row 9 / Column 1 → 4 (Hidden Single)
  9. Row 4 / Column 3 → 4 (Hidden Single)
  10. Locked Candidates Type 1 (Pointing): 5 in b1 => r2c567<>5
  11. Locked Candidates Type 1 (Pointing): 7 in b1 => r2c567<>7
  12. Row 1 / Column 7 → 7 (Hidden Single)
  13. Row 8 / Column 7 → 4 (Hidden Single)
  14. Naked Pair: 1,5 in r7c26 => r7c47<>1, r7c478<>5
  15. Row 7 / Column 4 → 3 (Naked Single)
  16. Row 9 / Column 8 → 3 (Hidden Single)
  17. Naked Pair: 5,7 in r38c5 => r46c5<>5, r6c5<>7
  18. Naked Pair: 6,8 in r27c7 => r4c7<>6, r46c7<>8
  19. Locked Candidates Type 1 (Pointing): 8 in b6 => r1c9<>8
  20. Hidden Pair: 2,8 in r46c9 => r46c9<>1, r46c9<>5, r4c9<>6, r46c9<>9
  21. Locked Candidates Type 1 (Pointing): 1 in b6 => r9c7<>1
  22. Locked Candidates Type 1 (Pointing): 6 in b6 => r5c46<>6
  23. Empty Rectangle: 7 in b5 (r59c2) => r9c4<>7
  24. W-Wing: 2/8 in r2c5,r4c9 connected by 8 in r6c59 => r4c5<>2
  25. Uniqueness Test 1: 5/7 in r2c13,r6c13 => r6c3<>5, r6c3<>7
  26. Row 6 / Column 3 → 1 (Naked Single)
  27. Row 4 / Column 7 → 1 (Hidden Single)
  28. Row 8 / Column 9 → 1 (Hidden Single)
  29. Locked Candidates Type 1 (Pointing): 5 in b9 => r9c246<>5
  30. W-Wing: 5/9 in r4c2,r6c7 connected by 9 in r46c5 => r6c1<>5
  31. Row 6 / Column 1 → 7 (Naked Single)
  32. Row 2 / Column 1 → 5 (Full House)
  33. Row 2 / Column 3 → 7 (Full House)
  34. Row 8 / Column 3 → 5 (Full House)
  35. Row 8 / Column 5 → 7 (Full House)
  36. Row 7 / Column 2 → 1 (Naked Single)
  37. Row 9 / Column 2 → 7 (Full House)
  38. Row 3 / Column 5 → 5 (Naked Single)
  39. Row 7 / Column 6 → 5 (Naked Single)
  40. Row 1 / Column 4 → 4 (Naked Single)
  41. Row 3 / Column 8 → 6 (Naked Single)
  42. Row 1 / Column 6 → 8 (Naked Single)
  43. Row 2 / Column 7 → 8 (Naked Single)
  44. Row 3 / Column 9 → 4 (Naked Single)
  45. Row 7 / Column 8 → 8 (Naked Single)
  46. Row 7 / Column 7 → 6 (Full House)
  47. Row 2 / Column 5 → 2 (Naked Single)
  48. Row 2 / Column 6 → 6 (Full House)
  49. Row 4 / Column 6 → 2 (Naked Single)
  50. Row 4 / Column 9 → 8 (Naked Single)
  51. Row 6 / Column 4 → 5 (Naked Single)
  52. Row 9 / Column 6 → 1 (Naked Single)
  53. Row 9 / Column 4 → 2 (Full House)
  54. Row 4 / Column 5 → 9 (Naked Single)
  55. Row 6 / Column 5 → 8 (Full House)
  56. Row 6 / Column 9 → 2 (Naked Single)
  57. Row 6 / Column 7 → 9 (Full House)
  58. Row 9 / Column 7 → 5 (Full House)
  59. Row 9 / Column 9 → 9 (Full House)
  60. Row 4 / Column 4 → 6 (Naked Single)
  61. Row 4 / Column 2 → 5 (Full House)
  62. Row 5 / Column 2 → 9 (Full House)
  63. Row 5 / Column 4 → 7 (Naked Single)
  64. Row 3 / Column 4 → 1 (Full House)
  65. Row 3 / Column 6 → 7 (Full House)
  66. Row 5 / Column 6 → 4 (Full House)
  67. Row 5 / Column 8 → 5 (Naked Single)
  68. Row 1 / Column 8 → 9 (Full House)
  69. Row 1 / Column 9 → 5 (Full House)
  70. Row 5 / Column 9 → 6 (Full House)
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