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.

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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