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

This Sudoku Puzzle has 90 steps and it is solved using Locked Candidates Type 1 (Pointing), undefined, Naked Pair, Naked Single, Discontinuous Nice Loop, Locked Candidates Type 2 (Claiming), AIC, Hidden Single, Continuous Nice Loop, Finned Swordfish, Multi Colors 1, Skyscraper, Hidden Pair, Locked Pair, Uniqueness Test 2, Naked Triple, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 6 in b1 => r1c8<>6
  2. Locked Candidates Type 1 (Pointing): 3 in b6 => r1c9<>3
  3. 2-String Kite: 9 in r5c4,r8c9 (connected by r4c9,r5c8) => r8c4<>9
  4. Locked Candidates Type 1 (Pointing): 9 in b8 => r4c5<>9
  5. Naked Pair: 1,6 in r7c6,r8c4 => r7c5,r8c6<>1, r8c6<>6
  6. Row 8 / Column 6 → 4 (Naked Single)
  7. XY-Wing: 1/9/5 in r38c9,r7c8 => r123c8<>5
  8. Discontinuous Nice Loop: 7/8 r3c8 =6= r3c7 -6- r6c7 =6= r6c4 -6- r8c4 -1- r8c9 -9- r4c9 =9= r5c8 =6= r3c8 => r3c8<>7, r3c8<>8
  9. Row 3 / Column 8 → 6 (Naked Single)
  10. Discontinuous Nice Loop: 8 r1c3 -8- r9c3 -9- r9c5 -2- r9c7 =2= r7c7 =1= r7c6 =6= r7c1 -6- r1c1 =6= r1c3 => r1c3<>8
  11. Discontinuous Nice Loop: 4 r4c1 -4- r4c5 =4= r6c5 =8= r6c2 =3= r4c1 => r4c1<>4
  12. Discontinuous Nice Loop: 7 r4c4 -7- r6c4 -6- r8c4 -1- r8c9 -9- r4c9 =9= r4c4 => r4c4<>7
  13. Discontinuous Nice Loop: 1 r5c4 -1- r8c4 =1= r8c9 =9= r4c9 -9- r4c4 =9= r5c4 => r5c4<>1
  14. Discontinuous Nice Loop: 5 r7c1 -5- r7c8 -9- r8c9 -1- r8c4 -6- r7c6 =6= r7c1 => r7c1<>5
  15. Locked Candidates Type 1 (Pointing): 5 in b7 => r123c2<>5
  16. Locked Candidates Type 2 (Claiming): 5 in r3 => r1c9,r2c7<>5
  17. AIC: 5 5- r7c8 -9- r5c8 =9= r4c9 =3= r4c1 -3- r7c1 =3= r7c2 =5= r9c2 -5 => r7c2,r9c78<>5
  18. Row 9 / Column 2 → 5 (Hidden Single)
  19. AIC: 4 4- r1c9 -1- r8c9 =1= r7c7 =2= r9c7 =4= r9c8 -4 => r12c8<>4
  20. Continuous Nice Loop: 4/5 9= r4c9 =3= r4c1 -3- r7c1 -6- r7c6 -1- r7c7 =1= r8c9 =9= r4c9 =3 => r4c9<>4, r4c9<>5
  21. Row 3 / Column 9 → 5 (Hidden Single)
  22. 2-String Kite: 1 in r1c9,r7c6 (connected by r7c7,r8c9) => r1c6<>1
  23. Finned Swordfish: 1 r357 c267 fr3c5 => r2c6<>1
  24. Multi Colors 1: 1 (r1c9,r7c7,r8c4) / (r7c6,r8c9), (r4c3,r5c6) / (r5c2) => r1c2<>1
  25. Discontinuous Nice Loop: 1 r1c3 -1- r1c9 =1= r8c9 -1- r8c4 -6- r8c3 =6= r1c3 => r1c3<>1
  26. Skyscraper: 1 in r1c5,r8c4 (connected by r18c9) => r2c4<>1
  27. Locked Candidates Type 1 (Pointing): 1 in b2 => r4c5<>1
  28. Finned Swordfish: 1 r257 c267 fr2c3 => r3c2<>1
  29. Locked Candidates Type 1 (Pointing): 1 in b1 => r2c7<>1
  30. Hidden Pair: 1,9 in r2c23 => r2c2<>4, r2c23<>7, r2c23<>8
  31. Discontinuous Nice Loop: 8 r1c5 -8- r6c5 =8= r6c2 =3= r6c9 =4= r1c9 =1= r1c5 => r1c5<>8
  32. XY-Chain: 7 7- r1c5 -1- r1c9 -4- r6c9 -3- r4c9 -9- r8c9 -1- r8c4 -6- r6c4 -7 => r2c4,r46c5<>7
  33. Row 2 / Column 4 → 5 (Naked Single)
  34. Row 1 / Column 1 → 5 (Hidden Single)
  35. Row 1 / Column 3 → 6 (Hidden Single)
  36. Locked Pair: 3,8 in r12c6 => r3c5,r4c6<>8
  37. Uniqueness Test 2: 3/8 in r1c68,r2c68 => r23c7,r5c8<>7
  38. Naked Triple: 1,4,8 in r1c9,r23c7 => r12c8<>8
  39. Locked Candidates Type 1 (Pointing): 8 in b3 => r9c7<>8
  40. XY-Chain: 3 3- r1c8 -7- r1c5 -1- r1c9 -4- r2c7 -8- r2c6 -3 => r1c6,r2c8<>3
  41. Row 1 / Column 6 → 8 (Naked Single)
  42. Row 2 / Column 8 → 7 (Naked Single)
  43. Row 2 / Column 6 → 3 (Naked Single)
  44. Row 1 / Column 8 → 3 (Naked Single)
  45. Locked Candidates Type 1 (Pointing): 7 in b1 => r56c2<>7
  46. Naked Triple: 3,4,8 in r6c259 => r6c7<>4
  47. XY-Chain: 1 1- r4c4 -9- r4c9 -3- r6c9 -4- r1c9 -1- r1c5 -7- r1c2 -4- r5c2 -1 => r4c3,r5c6<>1
  48. Row 2 / Column 3 → 1 (Hidden Single)
  49. Row 2 / Column 2 → 9 (Naked Single)
  50. Row 7 / Column 2 → 3 (Naked Single)
  51. Row 7 / Column 1 → 6 (Naked Single)
  52. Row 7 / Column 6 → 1 (Naked Single)
  53. Row 4 / Column 6 → 5 (Naked Single)
  54. Row 5 / Column 6 → 6 (Full House)
  55. Row 8 / Column 4 → 6 (Naked Single)
  56. Row 6 / Column 4 → 7 (Naked Single)
  57. Row 5 / Column 4 → 9 (Naked Single)
  58. Row 4 / Column 4 → 1 (Full House)
  59. Row 6 / Column 7 → 6 (Naked Single)
  60. Row 5 / Column 2 → 1 (Hidden Single)
  61. Row 6 / Column 9 → 3 (Hidden Single)
  62. Row 4 / Column 9 → 9 (Naked Single)
  63. Row 8 / Column 9 → 1 (Naked Single)
  64. Row 1 / Column 9 → 4 (Full House)
  65. Row 1 / Column 2 → 7 (Naked Single)
  66. Row 1 / Column 5 → 1 (Full House)
  67. Row 3 / Column 5 → 7 (Full House)
  68. Row 2 / Column 7 → 8 (Naked Single)
  69. Row 2 / Column 1 → 4 (Full House)
  70. Row 3 / Column 2 → 8 (Full House)
  71. Row 3 / Column 7 → 1 (Full House)
  72. Row 6 / Column 2 → 4 (Full House)
  73. Row 6 / Column 5 → 8 (Full House)
  74. Row 4 / Column 5 → 4 (Full House)
  75. Row 5 / Column 1 → 7 (Naked Single)
  76. Row 4 / Column 7 → 7 (Naked Single)
  77. Row 4 / Column 3 → 8 (Naked Single)
  78. Row 4 / Column 1 → 3 (Full House)
  79. Row 8 / Column 1 → 8 (Full House)
  80. Row 9 / Column 3 → 9 (Naked Single)
  81. Row 8 / Column 3 → 7 (Full House)
  82. Row 8 / Column 8 → 9 (Full House)
  83. Row 9 / Column 5 → 2 (Naked Single)
  84. Row 7 / Column 5 → 9 (Full House)
  85. Row 7 / Column 8 → 5 (Naked Single)
  86. Row 7 / Column 7 → 2 (Full House)
  87. Row 9 / Column 7 → 4 (Naked Single)
  88. Row 5 / Column 7 → 5 (Full House)
  89. Row 5 / Column 8 → 4 (Full House)
  90. Row 9 / Column 8 → 8 (Full House)
Show More...