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

This Sudoku Puzzle has 71 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Uniqueness Test 1, Empty Rectangle, Naked Triple, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 8 / Column 2 → 5 (Naked Single)
  2. Row 4 / Column 3 → 8 (Hidden Single)
  3. Row 9 / Column 3 → 3 (Hidden Single)
  4. Row 8 / Column 8 → 3 (Hidden Single)
  5. Row 1 / Column 8 → 4 (Naked Single)
  6. Row 7 / Column 5 → 5 (Hidden Single)
  7. Row 9 / Column 1 → 2 (Hidden Single)
  8. Row 7 / Column 8 → 8 (Hidden Single)
  9. Row 9 / Column 7 → 9 (Hidden Single)
  10. Row 8 / Column 1 → 8 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 4 in b7 => r7c79<>4
  12. Row 6 / Column 7 → 4 (Hidden Single)
  13. Row 9 / Column 9 → 4 (Hidden Single)
  14. Row 9 / Column 6 → 7 (Naked Single)
  15. Row 6 / Column 4 → 3 (Hidden Single)
  16. Row 6 / Column 1 → 5 (Hidden Single)
  17. Naked Pair: 1,6 in r2c8,r3c7 => r3c9<>1, r3c9<>6
  18. Row 3 / Column 9 → 7 (Naked Single)
  19. Naked Pair: 1,6 in r37c7 => r5c7<>1, r5c7<>6
  20. X-Wing: 2 r15 c35 => r6c35<>2
  21. Uniqueness Test 1: 3/5 in r1c79,r5c79 => r5c9<>3, r5c9<>5
  22. Row 5 / Column 7 → 3 (Hidden Single)
  23. Row 1 / Column 7 → 5 (Naked Single)
  24. Row 1 / Column 9 → 3 (Naked Single)
  25. Row 5 / Column 4 → 5 (Hidden Single)
  26. Row 4 / Column 9 → 5 (Hidden Single)
  27. Empty Rectangle: 6 in b6 (r2c18) => r5c1<>6
  28. Locked Candidates Type 1 (Pointing): 6 in b4 => r3c3<>6
  29. Naked Triple: 4,8,9 in r3c345 => r3c1<>4, r3c1<>9
  30. XY-Wing: 7/9/4 in r17c1,r3c3 => r2c1,r7c3<>4
  31. Row 7 / Column 3 → 7 (Naked Single)
  32. Row 7 / Column 1 → 4 (Full House)
  33. Row 3 / Column 3 → 4 (Hidden Single)
  34. Row 4 / Column 5 → 4 (Hidden Single)
  35. Locked Candidates Type 1 (Pointing): 9 in b1 => r1c5<>9
  36. Locked Candidates Type 1 (Pointing): 7 in b4 => r2c2<>7
  37. W-Wing: 6/9 in r4c6,r6c3 connected by 9 in r46c8 => r6c6<>6
  38. Row 4 / Column 6 → 6 (Hidden Single)
  39. W-Wing: 9/2 in r1c3,r6c6 connected by 2 in r2c26 => r6c3<>9
  40. Row 6 / Column 3 → 6 (Naked Single)
  41. Row 5 / Column 9 → 6 (Hidden Single)
  42. Row 7 / Column 9 → 1 (Full House)
  43. Row 7 / Column 7 → 6 (Full House)
  44. Row 3 / Column 7 → 1 (Full House)
  45. Row 2 / Column 8 → 6 (Full House)
  46. Row 3 / Column 1 → 6 (Naked Single)
  47. Locked Candidates Type 1 (Pointing): 9 in b4 => r5c5<>9
  48. W-Wing: 1/7 in r2c1,r4c2 connected by 7 in r24c4 => r2c2,r5c1<>1
  49. Row 2 / Column 2 → 2 (Naked Single)
  50. Row 5 / Column 1 → 9 (Naked Single)
  51. Row 1 / Column 3 → 9 (Naked Single)
  52. Row 5 / Column 3 → 2 (Full House)
  53. Row 5 / Column 5 → 1 (Full House)
  54. Row 2 / Column 6 → 4 (Naked Single)
  55. Row 1 / Column 1 → 7 (Naked Single)
  56. Row 1 / Column 5 → 2 (Full House)
  57. Row 2 / Column 1 → 1 (Full House)
  58. Row 2 / Column 4 → 7 (Full House)
  59. Row 9 / Column 5 → 8 (Naked Single)
  60. Row 9 / Column 4 → 1 (Full House)
  61. Row 8 / Column 6 → 9 (Naked Single)
  62. Row 6 / Column 6 → 2 (Full House)
  63. Row 8 / Column 4 → 4 (Full House)
  64. Row 4 / Column 4 → 9 (Naked Single)
  65. Row 3 / Column 4 → 8 (Full House)
  66. Row 3 / Column 5 → 9 (Full House)
  67. Row 6 / Column 5 → 7 (Full House)
  68. Row 4 / Column 8 → 1 (Naked Single)
  69. Row 4 / Column 2 → 7 (Full House)
  70. Row 6 / Column 2 → 1 (Full House)
  71. Row 6 / Column 8 → 9 (Full House)
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