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.

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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