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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Naked Single, Skyscraper, AIC, Discontinuous Nice Loop, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 5 → 6 (Hidden Single)
  2. Row 8 / Column 6 → 7 (Hidden Single)
  3. Row 5 / Column 6 → 1 (Hidden Single)
  4. Row 1 / Column 6 → 5 (Hidden Single)
  5. Row 5 / Column 9 → 4 (Hidden Single)
  6. Row 6 / Column 6 → 4 (Hidden Single)
  7. Locked Candidates Type 1 (Pointing): 2 in b4 => r5c7<>2
  8. Locked Candidates Type 2 (Claiming): 9 in r5 => r46c2<>9
  9. Naked Pair: 1,3 in r8c49 => r8c18<>1, r8c128<>3
  10. Row 8 / Column 1 → 6 (Naked Single)
  11. Row 3 / Column 1 → 3 (Naked Single)
  12. Skyscraper: 1 in r3c5,r8c4 (connected by r38c9) => r2c4,r79c5<>1
  13. AIC: 6 6- r3c7 =6= r3c2 =4= r8c2 =5= r8c8 -5- r4c8 =5= r4c7 =2= r9c7 =6= r9c8 -6 => r12c8,r9c7<>6
  14. Row 9 / Column 8 → 6 (Hidden Single)
  15. Discontinuous Nice Loop: 3/8 r1c5 =4= r1c3 -4- r7c3 =4= r7c8 =1= r2c8 -1- r2c5 =1= r3c5 =4= r1c5 => r1c5<>3, r1c5<>8
  16. Row 1 / Column 5 → 4 (Naked Single)
  17. Naked Pair: 1,8 in r3c59 => r3c7<>8
  18. Row 3 / Column 7 → 6 (Naked Single)
  19. Row 1 / Column 4 → 6 (Hidden Single)
  20. Row 2 / Column 2 → 6 (Hidden Single)
  21. Row 3 / Column 5 → 8 (Hidden Single)
  22. Row 3 / Column 9 → 1 (Naked Single)
  23. Row 8 / Column 9 → 3 (Naked Single)
  24. Row 8 / Column 4 → 1 (Naked Single)
  25. Row 2 / Column 5 → 1 (Hidden Single)
  26. Row 7 / Column 8 → 1 (Hidden Single)
  27. Row 9 / Column 1 → 1 (Hidden Single)
  28. Row 7 / Column 3 → 4 (Hidden Single)
  29. Row 3 / Column 3 → 5 (Naked Single)
  30. Row 3 / Column 2 → 4 (Full House)
  31. Row 8 / Column 2 → 5 (Naked Single)
  32. Row 8 / Column 8 → 4 (Full House)
  33. Row 4 / Column 8 → 5 (Hidden Single)
  34. Row 4 / Column 4 → 9 (Hidden Single)
  35. Row 6 / Column 5 → 3 (Naked Single)
  36. Row 7 / Column 4 → 3 (Naked Single)
  37. Row 4 / Column 6 → 2 (Naked Single)
  38. Row 2 / Column 6 → 3 (Full House)
  39. Row 2 / Column 4 → 2 (Full House)
  40. Row 6 / Column 4 → 8 (Full House)
  41. Row 4 / Column 7 → 3 (Naked Single)
  42. Row 4 / Column 2 → 8 (Full House)
  43. Row 6 / Column 2 → 7 (Naked Single)
  44. Row 5 / Column 7 → 7 (Naked Single)
  45. Row 6 / Column 8 → 9 (Naked Single)
  46. Row 6 / Column 9 → 2 (Full House)
  47. Row 1 / Column 7 → 8 (Naked Single)
  48. Row 2 / Column 8 → 7 (Naked Single)
  49. Row 1 / Column 8 → 3 (Full House)
  50. Row 1 / Column 9 → 9 (Full House)
  51. Row 2 / Column 3 → 9 (Full House)
  52. Row 9 / Column 9 → 7 (Naked Single)
  53. Row 7 / Column 9 → 8 (Full House)
  54. Row 7 / Column 7 → 5 (Naked Single)
  55. Row 9 / Column 7 → 2 (Full House)
  56. Row 9 / Column 3 → 3 (Naked Single)
  57. Row 7 / Column 5 → 9 (Naked Single)
  58. Row 7 / Column 1 → 7 (Full House)
  59. Row 9 / Column 2 → 9 (Full House)
  60. Row 9 / Column 5 → 5 (Full House)
  61. Row 5 / Column 2 → 3 (Full House)
  62. Row 5 / Column 3 → 2 (Naked Single)
  63. Row 1 / Column 3 → 7 (Full House)
  64. Row 1 / Column 1 → 2 (Full House)
  65. Row 5 / Column 1 → 9 (Full House)
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