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

This Sudoku Puzzle has 74 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Single, Locked Candidates Type 2 (Claiming), Skyscraper, undefined, Naked Pair, Hidden Rectangle, Multi Colors 1, Hidden Pair, 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 7 → 7 (Hidden Single)
  2. Row 6 / Column 6 → 7 (Hidden Single)
  3. Row 4 / Column 4 → 4 (Hidden Single)
  4. Row 1 / Column 3 → 7 (Hidden Single)
  5. Row 4 / Column 1 → 7 (Hidden Single)
  6. Row 4 / Column 8 → 8 (Hidden Single)
  7. Locked Candidates Type 1 (Pointing): 5 in b4 => r1c2<>5
  8. Locked Candidates Type 1 (Pointing): 9 in b4 => r5c59<>9
  9. Row 5 / Column 9 → 6 (Naked Single)
  10. Row 2 / Column 6 → 6 (Hidden Single)
  11. Row 6 / Column 5 → 6 (Hidden Single)
  12. Row 2 / Column 7 → 8 (Hidden Single)
  13. Row 5 / Column 6 → 8 (Hidden Single)
  14. Row 2 / Column 2 → 4 (Hidden Single)
  15. Row 2 / Column 8 → 9 (Hidden Single)
  16. Locked Candidates Type 1 (Pointing): 9 in b6 => r79c9<>9
  17. Locked Candidates Type 2 (Claiming): 3 in c6 => r79c5,r8c4<>3
  18. Skyscraper: 3 in r2c3,r6c2 (connected by r26c4) => r1c2,r5c3<>3
  19. Row 1 / Column 2 → 6 (Naked Single)
  20. Row 3 / Column 7 → 6 (Hidden Single)
  21. Finned X-Wing: 2 c26 r48 fr7c6 => r8c4<>2
  22. Row 1 / Column 4 → 2 (Hidden Single)
  23. Row 3 / Column 9 → 2 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 1 in b3 => r1c15<>1
  25. Locked Candidates Type 1 (Pointing): 5 in b3 => r1c1<>5
  26. Naked Pair: 1,5 in r16c8 => r89c8<>1
  27. X-Wing: 3 r15 c15 => r789c1<>3
  28. Hidden Rectangle: 1/5 in r3c13,r7c13 => r7c1<>1
  29. Finned X-Wing: 2 r57 c35 fr7c6 => r9c5<>2
  30. XY-Chain: 1 1- r3c5 -8- r1c5 -3- r5c5 -2- r4c6 -1 => r4c5<>1
  31. XY-Chain: 9 9- r5c1 -3- r1c1 -8- r1c5 -3- r2c4 -1- r8c4 -9 => r8c1<>9
  32. Row 8 / Column 4 → 9 (Hidden Single)
  33. Row 6 / Column 9 → 9 (Hidden Single)
  34. Row 4 / Column 5 → 9 (Hidden Single)
  35. Multi Colors 1: 1 (r1c8,r2c3,r3c5,r4c9,r6c4) / (r2c4,r4c6,r6c8), (r8c1) / (r8c6) => r3c1,r79c3<>1
  36. Hidden Pair: 1,6 in r89c1 => r9c1<>9
  37. XYZ-Wing: 2/3/9 in r59c3,r8c2 => r7c3<>2
  38. Locked Candidates Type 2 (Claiming): 2 in r7 => r8c6<>2
  39. W-Wing: 1/3 in r6c4,r8c6 connected by 3 in r68c2 => r4c6<>1
  40. Row 4 / Column 6 → 2 (Naked Single)
  41. Row 4 / Column 2 → 5 (Naked Single)
  42. Row 4 / Column 9 → 1 (Full House)
  43. Row 6 / Column 8 → 5 (Full House)
  44. Row 5 / Column 5 → 3 (Naked Single)
  45. Row 6 / Column 4 → 1 (Full House)
  46. Row 6 / Column 2 → 3 (Full House)
  47. Row 2 / Column 4 → 3 (Full House)
  48. Row 8 / Column 2 → 2 (Full House)
  49. Row 2 / Column 3 → 1 (Full House)
  50. Row 1 / Column 8 → 1 (Naked Single)
  51. Row 1 / Column 5 → 8 (Naked Single)
  52. Row 3 / Column 5 → 1 (Full House)
  53. Row 5 / Column 1 → 9 (Naked Single)
  54. Row 5 / Column 3 → 2 (Full House)
  55. Row 8 / Column 8 → 6 (Naked Single)
  56. Row 9 / Column 8 → 2 (Full House)
  57. Row 3 / Column 3 → 5 (Naked Single)
  58. Row 3 / Column 1 → 8 (Full House)
  59. Row 1 / Column 1 → 3 (Full House)
  60. Row 1 / Column 7 → 4 (Naked Single)
  61. Row 1 / Column 9 → 5 (Full House)
  62. Row 9 / Column 5 → 4 (Naked Single)
  63. Row 7 / Column 5 → 2 (Full House)
  64. Row 7 / Column 1 → 5 (Naked Single)
  65. Row 8 / Column 1 → 1 (Naked Single)
  66. Row 8 / Column 6 → 3 (Full House)
  67. Row 9 / Column 1 → 6 (Full House)
  68. Row 7 / Column 6 → 1 (Full House)
  69. Row 9 / Column 9 → 3 (Naked Single)
  70. Row 7 / Column 9 → 4 (Full House)
  71. Row 7 / Column 7 → 9 (Naked Single)
  72. Row 7 / Column 3 → 3 (Full House)
  73. Row 9 / Column 3 → 9 (Full House)
  74. Row 9 / Column 7 → 1 (Full House)
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