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.

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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