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

This Sudoku Puzzle has 73 steps and it is solved using Hidden Single, Naked Pair, Hidden Pair, undefined, Locked Candidates Type 2 (Claiming), Discontinuous Nice Loop, Hidden Rectangle, Empty Rectangle, Locked Candidates Type 1 (Pointing), Naked Single, Full House techniques.

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

Solution Steps:

  1. Row 5 / Column 8 → 6 (Hidden Single)
  2. Row 4 / Column 1 → 6 (Hidden Single)
  3. Row 4 / Column 4 → 7 (Hidden Single)
  4. Row 3 / Column 8 → 8 (Hidden Single)
  5. Row 8 / Column 9 → 6 (Hidden Single)
  6. Row 1 / Column 8 → 2 (Hidden Single)
  7. Row 6 / Column 9 → 3 (Hidden Single)
  8. Row 8 / Column 7 → 7 (Hidden Single)
  9. Row 4 / Column 8 → 1 (Hidden Single)
  10. Row 2 / Column 7 → 9 (Hidden Single)
  11. Row 4 / Column 9 → 4 (Hidden Single)
  12. Row 8 / Column 3 → 3 (Hidden Single)
  13. Row 7 / Column 7 → 3 (Hidden Single)
  14. Naked Pair: 1,7 in r3c69 => r3c234<>1, r3c23<>7
  15. Hidden Pair: 3,6 in r19c4 => r1c4<>1, r1c4<>9, r9c4<>5
  16. XYZ-Wing: 1/4/5 in r12c1,r2c5 => r2c3<>1
  17. Locked Candidates Type 2 (Claiming): 1 in c3 => r56c2,r6c1<>1
  18. Discontinuous Nice Loop: 5 r2c3 -5- r4c3 -2- r4c5 =2= r6c5 =4= r2c5 -4- r3c4 -9- r1c5 =9= r1c2 =7= r2c3 => r2c3<>5
  19. Hidden Rectangle: 1/5 in r1c19,r2c19 => r2c9<>1
  20. Empty Rectangle: 1 in b8 (r2c15) => r7c1<>1
  21. Discontinuous Nice Loop: 5 r5c3 -5- r4c3 -2- r4c5 =2= r6c5 =4= r2c5 -4- r3c4 -9- r3c3 =9= r6c3 =1= r5c3 => r5c3<>5
  22. Discontinuous Nice Loop: 5 r6c1 -5- r1c1 -1- r2c1 =1= r2c5 =4= r6c5 =2= r4c5 -2- r4c3 -5- r6c1 => r6c1<>5
  23. Discontinuous Nice Loop: 4 r6c3 -4- r6c5 =4= r2c5 -4- r3c4 -9- r3c3 =9= r6c3 => r6c3<>4
  24. Discontinuous Nice Loop: 5 r6c3 -5- r4c3 -2- r4c5 =2= r6c5 =4= r2c5 -4- r3c4 -9- r3c3 =9= r6c3 => r6c3<>5
  25. Discontinuous Nice Loop: 1 r8c5 -1- r2c5 -4- r3c4 -9- r7c4 =9= r8c5 => r8c5<>1
  26. Locked Candidates Type 1 (Pointing): 1 in b8 => r7c2<>1
  27. Hidden Rectangle: 1/5 in r1c12,r8c12 => r8c2<>5
  28. Discontinuous Nice Loop: 4/5/8 r9c2 =7= r9c3 -7- r2c3 =7= r2c9 =5= r2c1 -5- r8c1 =5= r8c8 =9= r8c5 -9- r1c5 =9= r1c2 =7= r9c2 => r9c2<>4, r9c2<>5, r9c2<>8
  29. Row 9 / Column 2 → 7 (Naked Single)
  30. Row 2 / Column 3 → 7 (Hidden Single)
  31. Row 2 / Column 9 → 5 (Naked Single)
  32. Locked Candidates Type 1 (Pointing): 8 in b7 => r8c5<>8
  33. Row 8 / Column 5 → 9 (Naked Single)
  34. Row 8 / Column 8 → 5 (Naked Single)
  35. Row 9 / Column 8 → 4 (Naked Single)
  36. Row 7 / Column 8 → 9 (Full House)
  37. Row 9 / Column 3 → 5 (Naked Single)
  38. Row 4 / Column 3 → 2 (Naked Single)
  39. Row 4 / Column 5 → 8 (Naked Single)
  40. Row 4 / Column 7 → 5 (Full House)
  41. Row 9 / Column 5 → 6 (Naked Single)
  42. Row 1 / Column 5 → 1 (Naked Single)
  43. Row 9 / Column 4 → 3 (Naked Single)
  44. Row 9 / Column 6 → 8 (Full House)
  45. Row 1 / Column 1 → 5 (Naked Single)
  46. Row 1 / Column 9 → 7 (Naked Single)
  47. Row 3 / Column 9 → 1 (Full House)
  48. Row 2 / Column 5 → 4 (Naked Single)
  49. Row 2 / Column 1 → 1 (Full House)
  50. Row 6 / Column 5 → 2 (Full House)
  51. Row 3 / Column 6 → 7 (Naked Single)
  52. Row 1 / Column 4 → 6 (Naked Single)
  53. Row 1 / Column 2 → 9 (Naked Single)
  54. Row 1 / Column 6 → 3 (Full House)
  55. Row 3 / Column 4 → 9 (Full House)
  56. Row 8 / Column 1 → 8 (Naked Single)
  57. Row 8 / Column 2 → 1 (Full House)
  58. Row 6 / Column 7 → 8 (Naked Single)
  59. Row 5 / Column 7 → 2 (Full House)
  60. Row 3 / Column 3 → 4 (Naked Single)
  61. Row 3 / Column 2 → 2 (Full House)
  62. Row 6 / Column 1 → 4 (Naked Single)
  63. Row 7 / Column 1 → 2 (Full House)
  64. Row 7 / Column 2 → 4 (Full House)
  65. Row 5 / Column 3 → 1 (Naked Single)
  66. Row 6 / Column 3 → 9 (Full House)
  67. Row 6 / Column 2 → 5 (Naked Single)
  68. Row 5 / Column 2 → 8 (Full House)
  69. Row 6 / Column 4 → 1 (Full House)
  70. Row 5 / Column 6 → 5 (Naked Single)
  71. Row 5 / Column 4 → 4 (Full House)
  72. Row 7 / Column 4 → 5 (Full House)
  73. Row 7 / Column 6 → 1 (Full House)
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