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.

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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