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

This Sudoku Puzzle has 78 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Naked Triple, Discontinuous Nice Loop, Sue de Coq, Hidden Rectangle, Simple Colors Trap, AIC, Naked Pair techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 4 → 7 (Hidden Single)
  2. Row 1 / Column 5 → 8 (Hidden Single)
  3. Row 2 / Column 1 → 1 (Hidden Single)
  4. Row 4 / Column 1 → 6 (Naked Single)
  5. Row 7 / Column 4 → 1 (Hidden Single)
  6. Row 2 / Column 5 → 5 (Hidden Single)
  7. Row 1 / Column 1 → 5 (Hidden Single)
  8. Row 9 / Column 4 → 5 (Hidden Single)
  9. Row 4 / Column 9 → 5 (Hidden Single)
  10. Row 6 / Column 6 → 5 (Hidden Single)
  11. Row 2 / Column 7 → 9 (Hidden Single)
  12. Row 1 / Column 6 → 9 (Hidden Single)
  13. Row 1 / Column 3 → 2 (Hidden Single)
  14. Row 1 / Column 4 → 6 (Naked Single)
  15. Row 3 / Column 4 → 2 (Full House)
  16. Row 3 / Column 6 → 3 (Full House)
  17. Row 7 / Column 8 → 5 (Hidden Single)
  18. Row 5 / Column 6 → 1 (Hidden Single)
  19. Row 4 / Column 2 → 1 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 2 in b5 => r89c5<>2
  21. Locked Candidates Type 1 (Pointing): 4 in b5 => r89c5<>4
  22. Locked Candidates Type 1 (Pointing): 6 in b5 => r89c5<>6
  23. Locked Candidates Type 2 (Claiming): 3 in r7 => r8c13,r9c2<>3
  24. XYZ-Wing: 4/6/9 in r59c2,r8c3 => r7c2<>4
  25. Naked Triple: 3,6,7 in r137c2 => r9c2<>6
  26. XY-Chain: 4 4- r1c7 -7- r1c2 -3- r7c2 -6- r8c3 -4 => r8c7<>4
  27. XY-Chain: 3 3- r2c9 -6- r2c3 -3- r1c2 -7- r3c2 -6- r7c2 -3- r7c1 -2- r8c1 -9- r8c5 -3 => r8c9<>3
  28. Discontinuous Nice Loop: 6 r7c6 -6- r7c2 -3- r1c2 -7- r1c7 -4- r7c7 =4= r7c6 => r7c6<>6
  29. XY-Chain: 4 4- r7c6 -2- r7c1 -3- r7c2 -6- r8c3 -4 => r8c6<>4
  30. Sue de Coq: r8c13 - {2469} (r8c6 - {26}, r9c2 - {49}) => r8c79<>2, r8c789<>6
  31. Hidden Rectangle: 1/7 in r6c78,r8c78 => r6c8<>7
  32. Discontinuous Nice Loop: 4 r5c9 -4- r5c2 =4= r9c2 -4- r8c3 -6- r2c3 -3- r2c9 =3= r9c9 =2= r5c9 => r5c9<>4
  33. Discontinuous Nice Loop: 4 r9c7 -4- r9c2 -9- r5c2 =9= r5c1 =8= r6c1 -8- r6c7 =8= r9c7 => r9c7<>4
  34. Discontinuous Nice Loop: 3 r9c8 -3- r9c5 -9- r9c2 -4- r8c3 -6- r2c3 -3- r2c9 =3= r9c9 -3- r9c8 => r9c8<>3
  35. Discontinuous Nice Loop: 6 r9c7 -6- r7c7 =6= r7c2 =3= r7c1 -3- r6c1 -8- r6c7 =8= r9c7 => r9c7<>6
  36. Simple Colors Trap: 6 (r2c3,r6c7,r7c2,r8c6) / (r2c9,r3c2,r7c7,r8c3,r9c6) => r56c9<>6
  37. AIC: 2 2- r4c5 -4- r6c5 -6- r6c7 =6= r7c7 -6- r7c2 -3- r7c1 =3= r6c1 =8= r5c1 -8- r5c9 -2 => r4c7,r5c5<>2
  38. Row 4 / Column 5 → 2 (Hidden Single)
  39. Row 5 / Column 9 → 2 (Hidden Single)
  40. Naked Pair: 4,7 in r14c7 => r67c7<>4, r68c7<>7
  41. Row 8 / Column 7 → 1 (Naked Single)
  42. Row 7 / Column 6 → 4 (Hidden Single)
  43. Row 6 / Column 8 → 1 (Hidden Single)
  44. W-Wing: 4/7 in r4c3,r8c9 connected by 7 in r6c39 => r8c3<>4
  45. Row 8 / Column 3 → 6 (Naked Single)
  46. Row 2 / Column 3 → 3 (Naked Single)
  47. Row 2 / Column 9 → 6 (Full House)
  48. Row 7 / Column 2 → 3 (Naked Single)
  49. Row 8 / Column 6 → 2 (Naked Single)
  50. Row 9 / Column 6 → 6 (Full House)
  51. Row 1 / Column 2 → 7 (Naked Single)
  52. Row 3 / Column 2 → 6 (Full House)
  53. Row 7 / Column 1 → 2 (Naked Single)
  54. Row 7 / Column 7 → 6 (Full House)
  55. Row 8 / Column 1 → 9 (Naked Single)
  56. Row 9 / Column 2 → 4 (Full House)
  57. Row 5 / Column 2 → 9 (Full House)
  58. Row 1 / Column 7 → 4 (Naked Single)
  59. Row 1 / Column 8 → 3 (Full House)
  60. Row 6 / Column 7 → 8 (Naked Single)
  61. Row 5 / Column 1 → 8 (Naked Single)
  62. Row 6 / Column 1 → 3 (Full House)
  63. Row 8 / Column 5 → 3 (Naked Single)
  64. Row 9 / Column 5 → 9 (Full House)
  65. Row 9 / Column 8 → 8 (Naked Single)
  66. Row 4 / Column 7 → 7 (Naked Single)
  67. Row 9 / Column 7 → 2 (Full House)
  68. Row 9 / Column 9 → 3 (Full House)
  69. Row 4 / Column 3 → 4 (Full House)
  70. Row 6 / Column 3 → 7 (Full House)
  71. Row 3 / Column 8 → 7 (Naked Single)
  72. Row 3 / Column 9 → 8 (Full House)
  73. Row 6 / Column 9 → 4 (Naked Single)
  74. Row 5 / Column 8 → 6 (Full House)
  75. Row 8 / Column 8 → 4 (Full House)
  76. Row 6 / Column 5 → 6 (Full House)
  77. Row 8 / Column 9 → 7 (Full House)
  78. Row 5 / Column 5 → 4 (Full House)
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