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

This Sudoku Puzzle has 82 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Skyscraper, Naked Single, Hidden Pair, Hidden Rectangle, undefined, Locked Candidates Type 2 (Claiming), Naked Triple, Naked Pair, Simple Colors Trap, Sue de Coq, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 4 → 9 (Hidden Single)
  2. Row 4 / Column 9 → 9 (Hidden Single)
  3. Row 3 / Column 6 → 7 (Hidden Single)
  4. Row 6 / Column 4 → 4 (Hidden Single)
  5. Row 1 / Column 9 → 7 (Hidden Single)
  6. Row 8 / Column 1 → 9 (Hidden Single)
  7. Row 6 / Column 8 → 7 (Hidden Single)
  8. Row 5 / Column 1 → 7 (Hidden Single)
  9. Row 6 / Column 3 → 9 (Hidden Single)
  10. Row 9 / Column 2 → 7 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 8 in b1 => r6c1<>8
  12. Locked Candidates Type 1 (Pointing): 2 in b7 => r9c79<>2
  13. Skyscraper: 5 in r1c4,r2c2 (connected by r8c24) => r1c3,r2c6<>5
  14. Row 2 / Column 6 → 6 (Naked Single)
  15. Locked Candidates Type 1 (Pointing): 6 in b3 => r3c13<>6
  16. Hidden Pair: 6,9 in r79c5 => r79c5<>1, r7c5<>5, r79c5<>8
  17. Row 7 / Column 3 → 5 (Hidden Single)
  18. Row 3 / Column 3 → 2 (Naked Single)
  19. Row 2 / Column 2 → 5 (Hidden Single)
  20. Row 9 / Column 1 → 2 (Hidden Single)
  21. Locked Candidates Type 1 (Pointing): 2 in b2 => r1c7<>2
  22. Row 6 / Column 7 → 2 (Hidden Single)
  23. Row 4 / Column 4 → 2 (Hidden Single)
  24. Row 1 / Column 5 → 2 (Hidden Single)
  25. Locked Candidates Type 1 (Pointing): 3 in b5 => r89c6<>3
  26. Locked Candidates Type 1 (Pointing): 1 in b8 => r46c6<>1
  27. Locked Candidates Type 1 (Pointing): 8 in b8 => r9c9<>8
  28. Hidden Rectangle: 1/2 in r2c89,r8c89 => r8c9<>1
  29. XY-Chain: 6 6- r1c3 -1- r1c7 -5- r1c4 -8- r9c4 -3- r8c4 -5- r8c6 -1- r8c2 -6 => r9c3<>6
  30. Row 1 / Column 3 → 6 (Hidden Single)
  31. Locked Candidates Type 1 (Pointing): 1 in b1 => r67c1<>1
  32. Locked Candidates Type 2 (Claiming): 1 in r7 => r8c8,r9c79<>1
  33. Naked Triple: 1,3,8 in r9c346 => r9c79<>3
  34. W-Wing: 8/1 in r4c2,r9c6 connected by 1 in r8c26 => r4c6<>8
  35. Row 4 / Column 6 → 3 (Naked Single)
  36. Finned X-Wing: 3 r67 c19 fr7c7 fr7c8 => r8c9<>3
  37. XYZ-Wing: 2/3/6 in r38c8,r8c9 => r7c8<>6
  38. XY-Chain: 2 2- r2c8 -1- r4c8 -8- r4c2 -1- r8c2 -6- r8c9 -2 => r2c9,r8c8<>2
  39. Row 2 / Column 8 → 2 (Hidden Single)
  40. Row 8 / Column 9 → 2 (Hidden Single)
  41. Naked Pair: 3,6 in r38c8 => r7c8<>3
  42. Simple Colors Trap: 3 (r3c8,r6c1,r8c4,r9c3) / (r5c3,r6c9,r7c1,r8c8,r9c4) => r3c9<>3
  43. Sue de Coq: r23c9 - {1456} (r9c9 - {46}, r1c7 - {15}) => r3c7<>5, r7c9<>6
  44. 2-String Kite: 5 in r3c5,r5c7 (connected by r1c7,r3c9) => r5c5<>5
  45. Locked Candidates Type 1 (Pointing): 5 in b5 => r6c9<>5
  46. W-Wing: 8/1 in r5c5,r9c6 connected by 1 in r59c3 => r6c6<>8
  47. Row 6 / Column 6 → 5 (Naked Single)
  48. Row 8 / Column 6 → 1 (Naked Single)
  49. Row 9 / Column 6 → 8 (Full House)
  50. Row 8 / Column 2 → 6 (Naked Single)
  51. Row 9 / Column 4 → 3 (Naked Single)
  52. Row 7 / Column 1 → 3 (Naked Single)
  53. Row 9 / Column 3 → 1 (Full House)
  54. Row 5 / Column 3 → 3 (Full House)
  55. Row 8 / Column 8 → 3 (Naked Single)
  56. Row 8 / Column 4 → 5 (Full House)
  57. Row 1 / Column 4 → 8 (Full House)
  58. Row 3 / Column 5 → 5 (Full House)
  59. Row 6 / Column 1 → 6 (Naked Single)
  60. Row 3 / Column 8 → 6 (Naked Single)
  61. Row 1 / Column 1 → 1 (Naked Single)
  62. Row 1 / Column 7 → 5 (Full House)
  63. Row 3 / Column 9 → 4 (Naked Single)
  64. Row 2 / Column 1 → 4 (Naked Single)
  65. Row 2 / Column 9 → 1 (Full House)
  66. Row 3 / Column 1 → 8 (Full House)
  67. Row 3 / Column 7 → 3 (Full House)
  68. Row 5 / Column 7 → 1 (Naked Single)
  69. Row 9 / Column 9 → 6 (Naked Single)
  70. Row 7 / Column 9 → 8 (Naked Single)
  71. Row 4 / Column 8 → 8 (Naked Single)
  72. Row 7 / Column 8 → 1 (Full House)
  73. Row 4 / Column 2 → 1 (Full House)
  74. Row 6 / Column 2 → 8 (Full House)
  75. Row 5 / Column 5 → 8 (Naked Single)
  76. Row 5 / Column 9 → 5 (Full House)
  77. Row 6 / Column 9 → 3 (Full House)
  78. Row 6 / Column 5 → 1 (Full House)
  79. Row 7 / Column 7 → 9 (Naked Single)
  80. Row 7 / Column 5 → 6 (Full House)
  81. Row 9 / Column 5 → 9 (Full House)
  82. Row 9 / Column 7 → 4 (Full House)
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