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

This Sudoku Puzzle has 70 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Naked Triple, Naked Pair, undefined, Swordfish, Locked Pair, Full House techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 5 → 7 (Naked Single)
  2. Row 5 / Column 7 → 4 (Naked Single)
  3. Row 6 / Column 4 → 3 (Naked Single)
  4. Row 6 / Column 6 → 1 (Naked Single)
  5. Row 5 / Column 9 → 5 (Hidden Single)
  6. Row 1 / Column 3 → 4 (Hidden Single)
  7. Row 1 / Column 5 → 6 (Hidden Single)
  8. Row 1 / Column 7 → 7 (Hidden Single)
  9. Row 3 / Column 4 → 5 (Hidden Single)
  10. Row 8 / Column 8 → 5 (Hidden Single)
  11. Row 7 / Column 1 → 5 (Hidden Single)
  12. Row 1 / Column 2 → 5 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 9 in b5 => r4c12<>9
  14. Locked Candidates Type 1 (Pointing): 8 in b6 => r6c23<>8
  15. Naked Triple: 3,4,7 in r8c246 => r8c19<>3, r8c1<>7, r8c9<>4
  16. Row 9 / Column 9 → 4 (Hidden Single)
  17. Naked Triple: 2,3,7 in r468c2 => r2c2<>2, r29c2<>3, r29c2<>7
  18. Row 2 / Column 1 → 7 (Hidden Single)
  19. Locked Candidates Type 1 (Pointing): 2 in b1 => r4c1<>2
  20. Naked Pair: 8,9 in r2c24 => r2c689<>8, r2c689<>9
  21. Naked Pair: 2,3 in r2c6,r3c5 => r1c6<>2, r1c6<>3
  22. Naked Triple: 3,8,9 in r357c3 => r9c3<>3, r9c3<>8, r9c3<>9
  23. X-Wing: 8 c24 r29 => r9c1<>8
  24. Swordfish: 3 c357 r379 => r3c19,r7c69,r9c1<>3
  25. Locked Candidates Type 1 (Pointing): 3 in b9 => r3c7<>3
  26. Swordfish: 9 r357 c139 => r1c19,r9c1<>9
  27. Locked Pair: 1,6 in r89c1 => r4c1,r9c3<>6
  28. Row 4 / Column 1 → 3 (Naked Single)
  29. Row 9 / Column 3 → 7 (Naked Single)
  30. Row 4 / Column 2 → 2 (Naked Single)
  31. Row 6 / Column 3 → 6 (Naked Single)
  32. Row 8 / Column 2 → 3 (Naked Single)
  33. Row 9 / Column 4 → 8 (Naked Single)
  34. Row 6 / Column 2 → 7 (Naked Single)
  35. Row 8 / Column 6 → 4 (Naked Single)
  36. Row 2 / Column 4 → 9 (Naked Single)
  37. Row 7 / Column 6 → 2 (Naked Single)
  38. Row 9 / Column 2 → 9 (Naked Single)
  39. Row 2 / Column 2 → 8 (Full House)
  40. Row 4 / Column 6 → 9 (Naked Single)
  41. Row 4 / Column 4 → 4 (Full House)
  42. Row 8 / Column 4 → 7 (Full House)
  43. Row 1 / Column 6 → 8 (Naked Single)
  44. Row 2 / Column 6 → 3 (Full House)
  45. Row 3 / Column 5 → 2 (Full House)
  46. Row 7 / Column 3 → 8 (Naked Single)
  47. Row 1 / Column 1 → 2 (Naked Single)
  48. Row 3 / Column 1 → 9 (Naked Single)
  49. Row 3 / Column 3 → 3 (Full House)
  50. Row 5 / Column 3 → 9 (Full House)
  51. Row 5 / Column 1 → 8 (Full House)
  52. Row 3 / Column 7 → 1 (Naked Single)
  53. Row 3 / Column 9 → 8 (Full House)
  54. Row 1 / Column 8 → 9 (Naked Single)
  55. Row 1 / Column 9 → 3 (Full House)
  56. Row 4 / Column 7 → 6 (Naked Single)
  57. Row 4 / Column 8 → 1 (Full House)
  58. Row 7 / Column 7 → 3 (Naked Single)
  59. Row 9 / Column 7 → 2 (Full House)
  60. Row 6 / Column 9 → 2 (Naked Single)
  61. Row 6 / Column 8 → 8 (Full House)
  62. Row 7 / Column 5 → 1 (Naked Single)
  63. Row 7 / Column 9 → 9 (Full House)
  64. Row 9 / Column 5 → 3 (Full House)
  65. Row 9 / Column 8 → 6 (Naked Single)
  66. Row 2 / Column 8 → 2 (Full House)
  67. Row 2 / Column 9 → 6 (Full House)
  68. Row 8 / Column 9 → 1 (Full House)
  69. Row 9 / Column 1 → 1 (Full House)
  70. Row 8 / Column 1 → 6 (Full House)
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