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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Hidden Pair, undefined, Naked Pair, Empty Rectangle, Naked Single, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 1 → 1 (Hidden Single)
  2. Row 8 / Column 5 → 9 (Hidden Single)
  3. Row 8 / Column 7 → 1 (Hidden Single)
  4. Row 1 / Column 5 → 1 (Hidden Single)
  5. Row 8 / Column 9 → 6 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 5 in b3 => r45c8<>5
  7. Locked Candidates Type 1 (Pointing): 4 in b9 => r13c8<>4
  8. Locked Candidates Type 2 (Claiming): 5 in r5 => r4c45,r6c5<>5
  9. Row 3 / Column 5 → 5 (Hidden Single)
  10. Row 1 / Column 8 → 5 (Hidden Single)
  11. Locked Candidates Type 2 (Claiming): 2 in c3 => r46c1<>2
  12. Naked Triple: 4,7,8 in r13c6,r2c5 => r123c4<>4, r123c4<>8, r23c4<>7
  13. Naked Triple: 4,7,8 in r4c45,r6c5 => r5c46<>7
  14. Hidden Pair: 2,3 in r7c12 => r7c12<>4, r7c1<>5, r7c2<>8, r7c2<>9
  15. Row 9 / Column 2 → 9 (Hidden Single)
  16. Locked Candidates Type 1 (Pointing): 5 in b7 => r8c4<>5
  17. 2-String Kite: 7 in r2c3,r9c6 (connected by r2c5,r3c6) => r9c3<>7
  18. Locked Candidates Type 1 (Pointing): 7 in b7 => r8c4<>7
  19. Naked Pair: 4,8 in r9c38 => r9c46<>4, r9c46<>8
  20. Empty Rectangle: 7 in b5 (r2c35) => r4c3<>7
  21. W-Wing: 6/3 in r2c4,r5c7 connected by 3 in r1c47 => r2c7<>6
  22. Row 2 / Column 4 → 6 (Hidden Single)
  23. Row 3 / Column 4 → 2 (Naked Single)
  24. Row 1 / Column 4 → 3 (Naked Single)
  25. Row 1 / Column 2 → 2 (Hidden Single)
  26. Row 7 / Column 2 → 3 (Naked Single)
  27. Row 5 / Column 2 → 7 (Naked Single)
  28. Row 7 / Column 1 → 2 (Naked Single)
  29. Row 5 / Column 8 → 6 (Naked Single)
  30. Row 5 / Column 7 → 3 (Naked Single)
  31. Row 4 / Column 1 → 3 (Hidden Single)
  32. Row 4 / Column 8 → 7 (Hidden Single)
  33. Row 6 / Column 5 → 7 (Hidden Single)
  34. Row 3 / Column 7 → 6 (Hidden Single)
  35. Row 2 / Column 9 → 3 (Hidden Single)
  36. Row 9 / Column 4 → 7 (Hidden Single)
  37. Row 9 / Column 6 → 1 (Naked Single)
  38. Row 5 / Column 6 → 5 (Naked Single)
  39. Row 5 / Column 4 → 1 (Full House)
  40. Row 2 / Column 3 → 7 (Hidden Single)
  41. Row 3 / Column 1 → 4 (Naked Single)
  42. Row 3 / Column 2 → 8 (Full House)
  43. Row 8 / Column 2 → 4 (Full House)
  44. Row 6 / Column 1 → 5 (Naked Single)
  45. Row 8 / Column 1 → 7 (Full House)
  46. Row 3 / Column 6 → 7 (Naked Single)
  47. Row 3 / Column 8 → 9 (Full House)
  48. Row 8 / Column 4 → 8 (Naked Single)
  49. Row 8 / Column 3 → 5 (Full House)
  50. Row 9 / Column 3 → 8 (Full House)
  51. Row 9 / Column 8 → 4 (Full House)
  52. Row 7 / Column 8 → 8 (Full House)
  53. Row 7 / Column 9 → 9 (Full House)
  54. Row 6 / Column 9 → 8 (Naked Single)
  55. Row 4 / Column 9 → 5 (Full House)
  56. Row 4 / Column 4 → 4 (Naked Single)
  57. Row 4 / Column 5 → 8 (Full House)
  58. Row 7 / Column 4 → 5 (Full House)
  59. Row 7 / Column 6 → 4 (Full House)
  60. Row 2 / Column 5 → 4 (Full House)
  61. Row 1 / Column 6 → 8 (Full House)
  62. Row 2 / Column 7 → 8 (Full House)
  63. Row 1 / Column 7 → 4 (Full House)
  64. Row 6 / Column 7 → 2 (Naked Single)
  65. Row 4 / Column 7 → 9 (Full House)
  66. Row 4 / Column 3 → 2 (Full House)
  67. Row 6 / Column 3 → 4 (Full House)
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