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

This Sudoku Puzzle has 72 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Triple, Naked Single, Remote Pair, Empty Rectangle, Locked Candidates Type 2 (Claiming), Swordfish, Skyscraper, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 3 / Column 9 → 6 (Hidden Single)
  2. Row 4 / Column 5 → 4 (Hidden Single)
  3. Row 6 / Column 8 → 4 (Hidden Single)
  4. Row 7 / Column 4 → 6 (Hidden Single)
  5. Row 2 / Column 5 → 8 (Hidden Single)
  6. Row 1 / Column 4 → 4 (Hidden Single)
  7. Row 1 / Column 7 → 3 (Hidden Single)
  8. Row 2 / Column 3 → 4 (Hidden Single)
  9. Row 5 / Column 5 → 6 (Hidden Single)
  10. Row 5 / Column 4 → 2 (Hidden Single)
  11. Row 7 / Column 6 → 2 (Hidden Single)
  12. Row 9 / Column 2 → 4 (Hidden Single)
  13. Row 9 / Column 6 → 9 (Hidden Single)
  14. Row 9 / Column 3 → 3 (Hidden Single)
  15. Row 9 / Column 5 → 5 (Hidden Single)
  16. Row 9 / Column 7 → 6 (Hidden Single)
  17. Row 8 / Column 3 → 6 (Hidden Single)
  18. Row 9 / Column 8 → 8 (Hidden Single)
  19. Row 8 / Column 1 → 5 (Hidden Single)
  20. Row 4 / Column 3 → 5 (Hidden Single)
  21. Row 5 / Column 9 → 5 (Hidden Single)
  22. Locked Candidates Type 1 (Pointing): 2 in b1 => r3c8<>2
  23. Row 2 / Column 8 → 2 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 1 in b5 => r6c79<>1
  25. Naked Triple: 1,7,9 in r1c23,r2c1 => r3c12<>1, r3c123<>7
  26. Row 3 / Column 3 → 2 (Naked Single)
  27. Row 4 / Column 2 → 2 (Hidden Single)
  28. Naked Triple: 1,7,9 in r178c2 => r5c2<>7, r5c2<>9
  29. Locked Candidates Type 1 (Pointing): 9 in b4 => r6c79<>9
  30. Remote Pair: 7/1 r6c5 -1- r8c5 -7- r9c4 -1- r9c9 => r6c9<>7
  31. Empty Rectangle: 1 in b3 (r27c1) => r7c8<>1
  32. Locked Candidates Type 2 (Claiming): 1 in r7 => r8c2<>1
  33. Locked Candidates Type 2 (Claiming): 1 in c8 => r2c79<>1
  34. Row 2 / Column 1 → 1 (Hidden Single)
  35. Row 7 / Column 2 → 1 (Hidden Single)
  36. Locked Candidates Type 1 (Pointing): 7 in b1 => r1c68<>7
  37. Locked Candidates Type 1 (Pointing): 9 in b1 => r1c8<>9
  38. Locked Candidates Type 1 (Pointing): 7 in b2 => r3c8<>7
  39. Swordfish: 7 c235 r168 => r6c167,r8c79<>7
  40. Skyscraper: 7 in r4c1,r5c8 (connected by r7c18) => r4c79<>7
  41. Row 4 / Column 7 → 1 (Naked Single)
  42. Row 4 / Column 9 → 3 (Naked Single)
  43. Row 4 / Column 1 → 7 (Full House)
  44. Row 6 / Column 9 → 2 (Naked Single)
  45. Row 6 / Column 3 → 9 (Naked Single)
  46. Row 1 / Column 3 → 7 (Full House)
  47. Row 7 / Column 1 → 9 (Naked Single)
  48. Row 7 / Column 8 → 7 (Full House)
  49. Row 8 / Column 2 → 7 (Full House)
  50. Row 6 / Column 7 → 8 (Naked Single)
  51. Row 1 / Column 2 → 9 (Naked Single)
  52. Row 5 / Column 8 → 9 (Naked Single)
  53. Row 5 / Column 7 → 7 (Full House)
  54. Row 9 / Column 9 → 1 (Naked Single)
  55. Row 9 / Column 4 → 7 (Full House)
  56. Row 8 / Column 5 → 1 (Full House)
  57. Row 3 / Column 4 → 1 (Full House)
  58. Row 6 / Column 5 → 7 (Full House)
  59. Row 6 / Column 1 → 3 (Naked Single)
  60. Row 3 / Column 1 → 8 (Full House)
  61. Row 5 / Column 2 → 8 (Full House)
  62. Row 5 / Column 6 → 3 (Full House)
  63. Row 6 / Column 6 → 1 (Full House)
  64. Row 3 / Column 2 → 3 (Full House)
  65. Row 2 / Column 7 → 9 (Naked Single)
  66. Row 2 / Column 9 → 7 (Full House)
  67. Row 8 / Column 9 → 9 (Full House)
  68. Row 8 / Column 7 → 2 (Full House)
  69. Row 1 / Column 6 → 5 (Naked Single)
  70. Row 1 / Column 8 → 1 (Full House)
  71. Row 3 / Column 8 → 5 (Full House)
  72. Row 3 / Column 6 → 7 (Full House)
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