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

This Sudoku Puzzle has 75 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Hidden Pair, undefined, Naked Triple, Naked Pair, Empty Rectangle, 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 7 / Column 1 → 3 (Naked Single)
  2. Row 7 / Column 5 → 9 (Naked Single)
  3. Row 1 / Column 5 → 1 (Hidden Single)
  4. Row 9 / Column 8 → 2 (Hidden Single)
  5. Row 9 / Column 9 → 1 (Hidden Single)
  6. Row 2 / Column 7 → 1 (Hidden Single)
  7. Locked Candidates Type 1 (Pointing): 6 in b2 => r1c79<>6
  8. Locked Candidates Type 1 (Pointing): 5 in b3 => r1c123<>5
  9. Locked Candidates Type 1 (Pointing): 8 in b7 => r9c7<>8
  10. Locked Candidates Type 1 (Pointing): 9 in b9 => r8c2<>9
  11. Hidden Pair: 1,2 in r4c34 => r4c34<>3, r4c3<>5, r4c3<>6
  12. X-Wing: 4 c15 r35 => r5c679<>4
  13. Row 7 / Column 7 → 4 (Hidden Single)
  14. X-Wing: 5 c15 r59 => r5c3679,r9c236<>5
  15. Row 1 / Column 7 → 5 (Hidden Single)
  16. Naked Triple: 3,6,7 in r4c8,r5c79 => r46c9,r6c8<>3, r4c9<>6, r6c89<>7
  17. Row 6 / Column 8 → 8 (Naked Single)
  18. Locked Candidates Type 1 (Pointing): 7 in b6 => r5c46<>7
  19. Naked Pair: 3,9 in r2c48 => r2c236<>3, r2c236<>9
  20. Naked Triple: 4,5,8 in r2c23,r3c1 => r1c13,r3c3<>8
  21. Row 1 / Column 1 → 2 (Naked Single)
  22. Hidden Pair: 4,5 in r5c15 => r5c5<>3
  23. 2-String Kite: 7 in r3c8,r7c3 (connected by r7c9,r8c8) => r3c3<>7
  24. Locked Candidates Type 1 (Pointing): 7 in b1 => r1c9<>7
  25. Empty Rectangle: 3 in b6 (r2c48) => r5c4<>3
  26. W-Wing: 4/5 in r2c2,r5c1 connected by 5 in r26c3 => r3c1,r46c2<>4
  27. Row 3 / Column 1 → 8 (Naked Single)
  28. Row 2 / Column 3 → 5 (Naked Single)
  29. Row 9 / Column 1 → 5 (Naked Single)
  30. Row 5 / Column 1 → 4 (Full House)
  31. Row 2 / Column 2 → 4 (Naked Single)
  32. Row 9 / Column 5 → 3 (Naked Single)
  33. Row 5 / Column 5 → 5 (Naked Single)
  34. Row 3 / Column 5 → 4 (Full House)
  35. Row 2 / Column 6 → 8 (Naked Single)
  36. Row 9 / Column 3 → 8 (Hidden Single)
  37. Row 8 / Column 7 → 8 (Hidden Single)
  38. Row 1 / Column 9 → 8 (Hidden Single)
  39. Row 8 / Column 6 → 5 (Hidden Single)
  40. Row 9 / Column 2 → 9 (Hidden Single)
  41. Naked Pair: 6,7 in r7c9,r9c7 => r8c89<>6, r8c89<>7
  42. Row 3 / Column 8 → 7 (Hidden Single)
  43. Row 4 / Column 8 → 6 (Hidden Single)
  44. Row 8 / Column 2 → 6 (Hidden Single)
  45. Row 7 / Column 3 → 7 (Full House)
  46. Row 7 / Column 9 → 6 (Full House)
  47. Row 8 / Column 4 → 7 (Naked Single)
  48. Row 9 / Column 6 → 6 (Full House)
  49. Row 9 / Column 7 → 7 (Full House)
  50. Row 5 / Column 7 → 3 (Naked Single)
  51. Row 3 / Column 7 → 6 (Full House)
  52. Row 5 / Column 6 → 9 (Naked Single)
  53. Row 5 / Column 9 → 7 (Naked Single)
  54. Row 1 / Column 6 → 3 (Naked Single)
  55. Row 5 / Column 4 → 2 (Naked Single)
  56. Row 5 / Column 3 → 6 (Full House)
  57. Row 1 / Column 2 → 7 (Naked Single)
  58. Row 1 / Column 3 → 9 (Naked Single)
  59. Row 1 / Column 4 → 6 (Full House)
  60. Row 2 / Column 4 → 9 (Full House)
  61. Row 3 / Column 3 → 3 (Full House)
  62. Row 2 / Column 8 → 3 (Full House)
  63. Row 3 / Column 9 → 9 (Full House)
  64. Row 8 / Column 8 → 9 (Full House)
  65. Row 8 / Column 9 → 3 (Full House)
  66. Row 4 / Column 6 → 4 (Naked Single)
  67. Row 6 / Column 6 → 7 (Full House)
  68. Row 4 / Column 4 → 1 (Naked Single)
  69. Row 6 / Column 4 → 3 (Full House)
  70. Row 6 / Column 3 → 1 (Naked Single)
  71. Row 4 / Column 3 → 2 (Full House)
  72. Row 4 / Column 9 → 5 (Naked Single)
  73. Row 4 / Column 2 → 3 (Full House)
  74. Row 6 / Column 2 → 5 (Full House)
  75. Row 6 / Column 9 → 4 (Full House)
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