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

This Sudoku Puzzle has 68 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Naked Single, Full House, Hidden Triple, undefined techniques.

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

Solution Steps:

  1. Row 3 / Column 9 → 2 (Hidden Single)
  2. Row 7 / Column 3 → 2 (Hidden Single)
  3. Row 9 / Column 9 → 6 (Hidden Single)
  4. Row 2 / Column 4 → 2 (Hidden Single)
  5. Row 5 / Column 8 → 2 (Hidden Single)
  6. Row 3 / Column 7 → 4 (Hidden Single)
  7. Row 7 / Column 9 → 4 (Hidden Single)
  8. Row 9 / Column 5 → 4 (Hidden Single)
  9. Row 5 / Column 9 → 9 (Hidden Single)
  10. Row 7 / Column 5 → 9 (Hidden Single)
  11. Row 9 / Column 4 → 7 (Hidden Single)
  12. Locked Candidates Type 1 (Pointing): 1 in b8 => r8c123<>1
  13. Locked Candidates Type 1 (Pointing): 5 in b8 => r8c8<>5
  14. Locked Candidates Type 2 (Claiming): 8 in r3 => r1c13,r2c12<>8
  15. Locked Candidates Type 2 (Claiming): 3 in c9 => r1c7,r2c8<>3
  16. Locked Candidates Type 2 (Claiming): 8 in c9 => r1c7,r2c8<>8
  17. Naked Pair: 5,7 in r1c57 => r1c136<>5, r1c16<>7
  18. Row 1 / Column 6 → 8 (Naked Single)
  19. Row 1 / Column 9 → 3 (Naked Single)
  20. Row 2 / Column 9 → 8 (Full House)
  21. Hidden Triple: 4,6,9 in r468c2 => r46c2<>3, r6c2<>1, r68c2<>8
  22. X-Wing: 7 r15 c57 => r3c5,r4c7<>7
  23. Row 4 / Column 7 → 3 (Naked Single)
  24. Row 4 / Column 4 → 5 (Naked Single)
  25. Row 8 / Column 4 → 1 (Naked Single)
  26. Row 6 / Column 4 → 3 (Full House)
  27. Row 8 / Column 6 → 5 (Full House)
  28. Locked Candidates Type 2 (Claiming): 7 in r3 => r2c12<>7
  29. Naked Pair: 6,9 in r14c3 => r8c3<>6, r89c3<>9
  30. Row 8 / Column 3 → 8 (Naked Single)
  31. Row 8 / Column 8 → 9 (Naked Single)
  32. Row 9 / Column 1 → 9 (Hidden Single)
  33. Row 1 / Column 1 → 6 (Naked Single)
  34. Row 1 / Column 3 → 9 (Naked Single)
  35. Row 8 / Column 1 → 4 (Naked Single)
  36. Row 8 / Column 2 → 6 (Full House)
  37. Row 4 / Column 3 → 6 (Naked Single)
  38. Naked Pair: 1,5 in r3c35 => r3c12<>1, r3c1<>5
  39. XY-Chain: 8 8- r5c7 -7- r5c5 -1- r3c5 -5- r3c3 -1- r9c3 -3- r9c8 -8- r6c8 -4- r6c2 -9- r6c6 -1- r6c1 -8 => r5c12,r6c8<>8
  40. Row 6 / Column 8 → 4 (Naked Single)
  41. Row 4 / Column 8 → 7 (Naked Single)
  42. Row 5 / Column 7 → 8 (Full House)
  43. Row 6 / Column 2 → 9 (Naked Single)
  44. Row 2 / Column 8 → 5 (Naked Single)
  45. Row 1 / Column 7 → 7 (Full House)
  46. Row 1 / Column 5 → 5 (Full House)
  47. Row 4 / Column 6 → 9 (Naked Single)
  48. Row 4 / Column 2 → 4 (Full House)
  49. Row 9 / Column 7 → 1 (Naked Single)
  50. Row 7 / Column 7 → 5 (Full House)
  51. Row 6 / Column 6 → 1 (Naked Single)
  52. Row 2 / Column 6 → 7 (Full House)
  53. Row 3 / Column 5 → 1 (Full House)
  54. Row 5 / Column 5 → 7 (Full House)
  55. Row 6 / Column 1 → 8 (Full House)
  56. Row 7 / Column 8 → 3 (Naked Single)
  57. Row 9 / Column 8 → 8 (Full House)
  58. Row 9 / Column 3 → 3 (Full House)
  59. Row 3 / Column 3 → 5 (Naked Single)
  60. Row 5 / Column 3 → 1 (Full House)
  61. Row 3 / Column 1 → 7 (Naked Single)
  62. Row 3 / Column 2 → 8 (Full House)
  63. Row 5 / Column 2 → 3 (Naked Single)
  64. Row 5 / Column 1 → 5 (Full House)
  65. Row 7 / Column 1 → 1 (Naked Single)
  66. Row 2 / Column 1 → 3 (Full House)
  67. Row 2 / Column 2 → 1 (Full House)
  68. Row 7 / Column 2 → 7 (Full House)
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