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

This Sudoku Puzzle has 78 steps and it is solved using Hidden Single, Naked Single, Locked Triple, Locked Candidates Type 1 (Pointing), Naked Triple, Hidden Pair, undefined, Discontinuous Nice Loop, Empty Rectangle, Grouped Discontinuous Nice Loop, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 4 / Column 7 → 5 (Hidden Single)
  2. Row 6 / Column 3 → 4 (Hidden Single)
  3. Row 1 / Column 2 → 4 (Hidden Single)
  4. Row 9 / Column 8 → 4 (Hidden Single)
  5. Row 6 / Column 7 → 3 (Hidden Single)
  6. Row 4 / Column 3 → 7 (Hidden Single)
  7. Row 9 / Column 9 → 6 (Hidden Single)
  8. Row 4 / Column 1 → 3 (Hidden Single)
  9. Row 4 / Column 5 → 9 (Naked Single)
  10. Row 8 / Column 9 → 7 (Hidden Single)
  11. Locked Triple: 1,3,9 in r1c456 => r1c3,r2c45,r3c46<>1, r1c38,r23c4,r3c6<>9, r1c8,r3c46<>3
  12. Row 3 / Column 8 → 3 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 5 in b7 => r3c2<>5
  14. Locked Candidates Type 1 (Pointing): 1 in b9 => r2c7<>1
  15. Naked Triple: 1,2,9 in r358c2 => r79c2<>1, r79c2<>2, r79c2<>9
  16. Hidden Pair: 3,4 in r8c45 => r8c45<>1, r8c4<>2, r8c4<>9
  17. W-Wing: 7/5 in r3c6,r9c2 connected by 5 in r7c26 => r9c6<>7
  18. Discontinuous Nice Loop: 1/6 r6c5 =7= r6c6 -7- r3c6 -5- r2c5 =5= r9c5 =7= r6c5 => r6c5<>1, r6c5<>6
  19. Row 6 / Column 5 → 7 (Naked Single)
  20. Row 6 / Column 8 → 6 (Hidden Single)
  21. Empty Rectangle: 9 in b3 (r6c19) => r2c1<>9
  22. Finned X-Wing: 1 r69 c16 fr9c4 fr9c5 => r7c6<>1
  23. Grouped Discontinuous Nice Loop: 9 r7c4 -9- r7c8 =9= r5c8 -9- r6c9 =9= r6c1 -9- r9c1 =9= r9c46 -9- r7c4 => r7c4<>9
  24. Grouped Discontinuous Nice Loop: 9 r7c6 -9- r7c8 =9= r5c8 -9- r6c9 =9= r6c1 -9- r9c1 =9= r9c46 -9- r7c6 => r7c6<>9
  25. Locked Candidates Type 1 (Pointing): 9 in b8 => r9c1<>9
  26. Locked Candidates Type 1 (Pointing): 9 in b7 => r8c7<>9
  27. Discontinuous Nice Loop: 9 r2c3 -9- r2c7 =9= r7c7 =1= r7c4 -1- r9c5 -5- r2c5 =5= r2c3 => r2c3<>9
  28. Locked Candidates Type 1 (Pointing): 9 in b1 => r3c9<>9
  29. Discontinuous Nice Loop: 2 r8c1 -2- r9c1 -1- r9c5 -5- r2c5 =5= r3c6 =7= r3c4 =6= r3c1 =8= r8c1 => r8c1<>2
  30. Almost Locked Set XZ-Rule: A=r5c2356 {12369}, B=r269c1 {1269}, X=9, Z=6 => r2c5<>6
  31. Row 5 / Column 5 → 6 (Hidden Single)
  32. Almost Locked Set XZ-Rule: A=r269c1 {1269}, B=r346c9 {1289}, X=9, Z=1 => r3c1<>1
  33. Almost Locked Set XY-Wing: A=r2c79 {129}, B=r69c1 {129}, C=r346c9 {1289}, X,Y=1,9, Z=2 => r2c1<>2
  34. Locked Candidates Type 1 (Pointing): 2 in b1 => r58c3<>2
  35. XY-Chain: 1 1- r2c1 -6- r2c4 -4- r2c5 -5- r9c5 -1 => r9c1<>1
  36. Row 9 / Column 1 → 2 (Naked Single)
  37. Row 5 / Column 2 → 2 (Hidden Single)
  38. Row 8 / Column 7 → 2 (Hidden Single)
  39. Row 2 / Column 7 → 9 (Naked Single)
  40. Row 7 / Column 7 → 1 (Full House)
  41. Row 7 / Column 8 → 9 (Full House)
  42. Row 5 / Column 8 → 8 (Naked Single)
  43. Row 1 / Column 8 → 2 (Full House)
  44. Row 4 / Column 9 → 2 (Naked Single)
  45. Row 4 / Column 4 → 8 (Full House)
  46. Row 6 / Column 9 → 9 (Full House)
  47. Row 1 / Column 3 → 8 (Naked Single)
  48. Row 2 / Column 9 → 1 (Naked Single)
  49. Row 3 / Column 9 → 8 (Full House)
  50. Row 6 / Column 1 → 1 (Naked Single)
  51. Row 5 / Column 3 → 9 (Full House)
  52. Row 6 / Column 6 → 2 (Full House)
  53. Row 2 / Column 1 → 6 (Naked Single)
  54. Row 8 / Column 3 → 1 (Naked Single)
  55. Row 2 / Column 4 → 4 (Naked Single)
  56. Row 3 / Column 1 → 9 (Naked Single)
  57. Row 8 / Column 1 → 8 (Full House)
  58. Row 3 / Column 3 → 5 (Naked Single)
  59. Row 2 / Column 3 → 2 (Full House)
  60. Row 2 / Column 5 → 5 (Full House)
  61. Row 3 / Column 2 → 1 (Full House)
  62. Row 8 / Column 2 → 9 (Naked Single)
  63. Row 8 / Column 4 → 3 (Naked Single)
  64. Row 8 / Column 5 → 4 (Full House)
  65. Row 3 / Column 6 → 7 (Naked Single)
  66. Row 3 / Column 4 → 6 (Full House)
  67. Row 9 / Column 5 → 1 (Naked Single)
  68. Row 1 / Column 5 → 3 (Full House)
  69. Row 5 / Column 4 → 1 (Naked Single)
  70. Row 5 / Column 6 → 3 (Full House)
  71. Row 7 / Column 6 → 5 (Naked Single)
  72. Row 1 / Column 4 → 9 (Naked Single)
  73. Row 1 / Column 6 → 1 (Full House)
  74. Row 9 / Column 6 → 9 (Full House)
  75. Row 7 / Column 2 → 7 (Naked Single)
  76. Row 7 / Column 4 → 2 (Full House)
  77. Row 9 / Column 4 → 7 (Full House)
  78. Row 9 / Column 2 → 5 (Full House)
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