7
5
9
9
8
4
6
3
3
4
2
5
8
9
2
7
4
8
9
2
1
5
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 Triple, undefined, Skyscraper, Continuous Nice Loop, Discontinuous Nice Loop, Naked Single, Full House 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 4 / Column 6 → 9 (Hidden Single)
  2. Row 1 / Column 1 → 4 (Hidden Single)
  3. Row 7 / Column 4 → 5 (Hidden Single)
  4. Row 5 / Column 2 → 9 (Hidden Single)
  5. Row 9 / Column 3 → 5 (Hidden Single)
  6. Row 7 / Column 5 → 7 (Hidden Single)
  7. Row 5 / Column 5 → 4 (Hidden Single)
  8. Row 8 / Column 4 → 4 (Hidden Single)
  9. Row 6 / Column 5 → 8 (Hidden Single)
  10. Locked Candidates Type 1 (Pointing): 7 in b2 => r2c7<>7
  11. Locked Candidates Type 1 (Pointing): 1 in b5 => r2c4<>1
  12. Locked Candidates Type 2 (Claiming): 3 in c4 => r6c6<>3
  13. Naked Triple: 1,5,6 in r4c23,r6c2 => r5c13,r6c1<>1, r5c13,r6c1<>6
  14. X-Wing: 8 c28 r28 => r8c1<>8
  15. Skyscraper: 3 in r1c6,r3c2 (connected by r8c26) => r1c3,r3c5<>3
  16. Continuous Nice Loop: 2/6/7 9= r9c1 =8= r5c1 =7= r6c1 -7- r6c6 -6- r8c6 -3- r9c5 =3= r9c7 =9= r9c1 =8 => r5c1<>2, r2c6,r9c17<>6, r6c47<>7
  17. Discontinuous Nice Loop: 2 r1c7 -2- r8c7 =2= r8c8 =8= r9c9 =6= r9c5 =3= r1c5 =5= r1c7 => r1c7<>2
  18. Discontinuous Nice Loop: 2 r1c9 -2- r1c6 -3- r1c5 =3= r9c5 =6= r9c9 =8= r1c9 => r1c9<>2
  19. Skyscraper: 2 in r5c9,r6c1 (connected by r3c19) => r5c3,r6c78<>2
  20. Row 5 / Column 3 → 8 (Naked Single)
  21. Row 5 / Column 1 → 7 (Naked Single)
  22. Row 6 / Column 1 → 2 (Naked Single)
  23. Row 1 / Column 9 → 8 (Hidden Single)
  24. Row 9 / Column 9 → 6 (Naked Single)
  25. Row 9 / Column 5 → 3 (Naked Single)
  26. Row 8 / Column 6 → 6 (Full House)
  27. Row 9 / Column 7 → 9 (Naked Single)
  28. Row 9 / Column 1 → 8 (Full House)
  29. Row 6 / Column 6 → 7 (Naked Single)
  30. Row 8 / Column 1 → 1 (Naked Single)
  31. Row 2 / Column 6 → 2 (Naked Single)
  32. Row 1 / Column 6 → 3 (Full House)
  33. Row 3 / Column 1 → 6 (Naked Single)
  34. Row 7 / Column 1 → 9 (Full House)
  35. Row 8 / Column 2 → 3 (Naked Single)
  36. Row 7 / Column 3 → 6 (Full House)
  37. Row 3 / Column 2 → 1 (Naked Single)
  38. Row 8 / Column 7 → 2 (Naked Single)
  39. Row 8 / Column 8 → 8 (Full House)
  40. Row 4 / Column 3 → 1 (Naked Single)
  41. Row 1 / Column 3 → 2 (Naked Single)
  42. Row 3 / Column 3 → 3 (Full House)
  43. Row 2 / Column 2 → 8 (Full House)
  44. Row 3 / Column 5 → 5 (Naked Single)
  45. Row 4 / Column 4 → 6 (Naked Single)
  46. Row 1 / Column 5 → 1 (Naked Single)
  47. Row 1 / Column 7 → 5 (Full House)
  48. Row 2 / Column 5 → 6 (Full House)
  49. Row 2 / Column 4 → 7 (Full House)
  50. Row 3 / Column 7 → 7 (Naked Single)
  51. Row 4 / Column 2 → 5 (Naked Single)
  52. Row 6 / Column 2 → 6 (Full House)
  53. Row 3 / Column 9 → 2 (Naked Single)
  54. Row 3 / Column 8 → 9 (Full House)
  55. Row 4 / Column 8 → 4 (Naked Single)
  56. Row 4 / Column 9 → 7 (Full House)
  57. Row 5 / Column 9 → 1 (Naked Single)
  58. Row 7 / Column 9 → 4 (Full House)
  59. Row 2 / Column 8 → 1 (Naked Single)
  60. Row 2 / Column 7 → 4 (Full House)
  61. Row 5 / Column 4 → 3 (Naked Single)
  62. Row 6 / Column 4 → 1 (Full House)
  63. Row 6 / Column 7 → 3 (Naked Single)
  64. Row 6 / Column 8 → 5 (Full House)
  65. Row 7 / Column 8 → 3 (Naked Single)
  66. Row 5 / Column 8 → 2 (Full House)
  67. Row 5 / Column 7 → 6 (Full House)
  68. Row 7 / Column 7 → 1 (Full House)
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