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

This Sudoku Puzzle has 68 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Rectangle, undefined, Discontinuous Nice Loop 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 2 / Column 9 → 5 (Naked Single)
  2. Row 2 / Column 7 → 3 (Naked Single)
  3. Row 3 / Column 8 → 4 (Naked Single)
  4. Row 1 / Column 8 → 6 (Naked Single)
  5. Row 1 / Column 7 → 7 (Full House)
  6. Row 3 / Column 2 → 5 (Naked Single)
  7. Row 5 / Column 8 → 9 (Hidden Single)
  8. Row 5 / Column 3 → 7 (Hidden Single)
  9. Row 4 / Column 9 → 7 (Hidden Single)
  10. Row 1 / Column 2 → 4 (Hidden Single)
  11. Row 6 / Column 8 → 3 (Hidden Single)
  12. Row 7 / Column 1 → 7 (Hidden Single)
  13. Row 6 / Column 9 → 8 (Hidden Single)
  14. Row 7 / Column 9 → 4 (Naked Single)
  15. Row 8 / Column 9 → 1 (Full House)
  16. Row 9 / Column 3 → 4 (Hidden Single)
  17. Row 9 / Column 2 → 1 (Hidden Single)
  18. Row 5 / Column 2 → 8 (Naked Single)
  19. Locked Candidates Type 1 (Pointing): 3 in b4 => r4c56<>3
  20. Locked Candidates Type 1 (Pointing): 5 in b4 => r6c56<>5
  21. Locked Candidates Type 1 (Pointing): 2 in b5 => r79c6<>2
  22. Locked Candidates Type 1 (Pointing): 6 in b5 => r89c5<>6
  23. Locked Candidates Type 2 (Claiming): 1 in r5 => r46c6<>1
  24. Row 6 / Column 6 → 2 (Naked Single)
  25. Row 4 / Column 6 → 8 (Naked Single)
  26. Hidden Rectangle: 1/3 in r3c46,r5c46 => r5c6<>3
  27. XY-Wing: 3/5/1 in r15c6,r3c4 => r3c6,r5c4<>1
  28. Row 3 / Column 4 → 1 (Hidden Single)
  29. Row 5 / Column 6 → 1 (Hidden Single)
  30. W-Wing: 5/3 in r1c6,r5c4 connected by 3 in r7c46 => r1c4<>5
  31. Row 1 / Column 6 → 5 (Hidden Single)
  32. Row 9 / Column 6 → 7 (Naked Single)
  33. Row 3 / Column 5 → 7 (Hidden Single)
  34. Row 5 / Column 5 → 3 (Hidden Single)
  35. Row 5 / Column 4 → 5 (Full House)
  36. Discontinuous Nice Loop: 2/6/8 r7c4 =3= r7c6 =9= r7c7 =5= r7c3 -5- r6c3 =5= r6c1 =1= r4c1 =3= r1c1 -3- r1c4 =3= r7c4 => r7c4<>2, r7c4<>6, r7c4<>8
  37. Row 7 / Column 4 → 3 (Naked Single)
  38. Row 1 / Column 4 → 8 (Naked Single)
  39. Row 1 / Column 1 → 3 (Full House)
  40. Row 7 / Column 6 → 9 (Naked Single)
  41. Row 3 / Column 6 → 3 (Full House)
  42. Row 2 / Column 5 → 9 (Full House)
  43. Row 3 / Column 3 → 9 (Full House)
  44. Row 4 / Column 3 → 3 (Hidden Single)
  45. Row 8 / Column 7 → 9 (Hidden Single)
  46. W-Wing: 5/6 in r6c3,r7c7 connected by 6 in r47c2 => r7c3<>5
  47. Row 7 / Column 7 → 5 (Hidden Single)
  48. Row 9 / Column 7 → 6 (Naked Single)
  49. Row 9 / Column 4 → 2 (Naked Single)
  50. Row 8 / Column 4 → 6 (Full House)
  51. Row 9 / Column 8 → 8 (Naked Single)
  52. Row 7 / Column 8 → 2 (Full House)
  53. Row 9 / Column 5 → 5 (Full House)
  54. Row 8 / Column 5 → 8 (Full House)
  55. Row 7 / Column 2 → 6 (Naked Single)
  56. Row 4 / Column 2 → 2 (Full House)
  57. Row 7 / Column 3 → 8 (Full House)
  58. Row 4 / Column 1 → 1 (Naked Single)
  59. Row 2 / Column 3 → 2 (Naked Single)
  60. Row 2 / Column 1 → 8 (Full House)
  61. Row 4 / Column 7 → 4 (Naked Single)
  62. Row 4 / Column 5 → 6 (Full House)
  63. Row 6 / Column 7 → 1 (Full House)
  64. Row 6 / Column 5 → 4 (Full House)
  65. Row 6 / Column 1 → 5 (Naked Single)
  66. Row 6 / Column 3 → 6 (Full House)
  67. Row 8 / Column 3 → 5 (Full House)
  68. Row 8 / Column 1 → 2 (Full House)
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