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

This Sudoku Puzzle has 77 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Hidden Rectangle, Naked Single, Uniqueness Test 1, Full House, Continuous Nice Loop, Skyscraper, Naked Pair, Naked Triple techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 5 → 9 (Hidden Single)
  2. Row 9 / Column 4 → 2 (Hidden Single)
  3. Row 4 / Column 1 → 1 (Hidden Single)
  4. Locked Candidates Type 1 (Pointing): 5 in b4 => r5c479<>5
  5. Row 6 / Column 7 → 5 (Hidden Single)
  6. Row 6 / Column 8 → 1 (Hidden Single)
  7. Row 5 / Column 7 → 3 (Hidden Single)
  8. Locked Candidates Type 1 (Pointing): 4 in b5 => r4c2<>4
  9. Locked Candidates Type 2 (Claiming): 3 in c5 => r3c6<>3
  10. 2-String Kite: 2 in r3c9,r4c2 (connected by r4c8,r5c9) => r3c2<>2
  11. Hidden Rectangle: 3/7 in r6c46,r8c46 => r8c6<>7
  12. 2-String Kite: 7 in r5c3,r8c4 (connected by r8c2,r9c3) => r5c4<>7
  13. Row 5 / Column 4 → 8 (Naked Single)
  14. Row 4 / Column 4 → 5 (Naked Single)
  15. Row 2 / Column 4 → 1 (Naked Single)
  16. Row 4 / Column 8 → 8 (Hidden Single)
  17. Row 2 / Column 6 → 5 (Hidden Single)
  18. Row 7 / Column 5 → 1 (Hidden Single)
  19. Row 8 / Column 9 → 1 (Hidden Single)
  20. Row 4 / Column 2 → 2 (Hidden Single)
  21. Locked Candidates Type 1 (Pointing): 7 in b5 => r6c2<>7
  22. Row 6 / Column 2 → 6 (Naked Single)
  23. Uniqueness Test 1: 3/7 in r6c46,r8c46 => r8c6<>3
  24. Row 8 / Column 4 → 3 (Hidden Single)
  25. Row 6 / Column 4 → 7 (Full House)
  26. Row 6 / Column 6 → 3 (Full House)
  27. Row 8 / Column 2 → 7 (Hidden Single)
  28. Row 5 / Column 2 → 4 (Naked Single)
  29. Row 5 / Column 1 → 5 (Naked Single)
  30. Row 5 / Column 3 → 7 (Full House)
  31. Locked Candidates Type 1 (Pointing): 9 in b7 => r3c1<>9
  32. Hidden Rectangle: 5/6 in r7c39,r9c39 => r9c3<>6
  33. Continuous Nice Loop: 2/4/6/9 9= r2c8 =2= r2c3 -2- r7c3 =2= r7c1 =9= r7c7 -9- r8c8 =9= r2c8 =2 => r3c3<>2, r2c8<>4, r2c8,r7c1<>6, r9c7<>9
  34. XYZ-Wing: 1/4/6 in r1c38,r3c3 => r1c1<>4
  35. Hidden Rectangle: 1/4 in r1c37,r3c37 => r1c7<>4
  36. Finned X-Wing: 6 r27 c37 fr7c9 => r9c7<>6
  37. XY-Chain: 4 4- r1c8 -6- r5c8 -2- r2c8 -9- r2c2 -8- r2c5 -4 => r1c5,r2c7<>4
  38. Skyscraper: 4 in r1c3,r8c1 (connected by r18c8) => r3c1,r9c3<>4
  39. Row 9 / Column 3 → 5 (Naked Single)
  40. Row 7 / Column 9 → 5 (Hidden Single)
  41. X-Wing: 6 r27 c37 => r1c37<>6
  42. Naked Pair: 1,4 in r13c3 => r2c3<>4
  43. Row 2 / Column 5 → 4 (Hidden Single)
  44. Row 3 / Column 6 → 7 (Naked Single)
  45. Row 4 / Column 5 → 6 (Naked Single)
  46. Row 4 / Column 6 → 4 (Full House)
  47. Row 9 / Column 5 → 7 (Naked Single)
  48. Row 1 / Column 9 → 7 (Hidden Single)
  49. Naked Triple: 2,3,8 in r3c159 => r3c27<>8
  50. Row 3 / Column 2 → 9 (Naked Single)
  51. Row 2 / Column 2 → 8 (Full House)
  52. W-Wing: 2/6 in r2c3,r5c8 connected by 6 in r1c18 => r2c8<>2
  53. Row 2 / Column 8 → 9 (Naked Single)
  54. Row 2 / Column 7 → 6 (Naked Single)
  55. Row 2 / Column 3 → 2 (Full House)
  56. Row 1 / Column 8 → 4 (Naked Single)
  57. Row 7 / Column 7 → 9 (Naked Single)
  58. Row 3 / Column 1 → 3 (Naked Single)
  59. Row 7 / Column 3 → 6 (Naked Single)
  60. Row 7 / Column 1 → 2 (Full House)
  61. Row 1 / Column 3 → 1 (Naked Single)
  62. Row 3 / Column 3 → 4 (Full House)
  63. Row 1 / Column 1 → 6 (Full House)
  64. Row 3 / Column 7 → 1 (Naked Single)
  65. Row 8 / Column 8 → 6 (Naked Single)
  66. Row 5 / Column 8 → 2 (Full House)
  67. Row 5 / Column 9 → 6 (Full House)
  68. Row 3 / Column 5 → 8 (Naked Single)
  69. Row 1 / Column 5 → 3 (Full House)
  70. Row 1 / Column 7 → 8 (Full House)
  71. Row 3 / Column 9 → 2 (Full House)
  72. Row 9 / Column 9 → 8 (Full House)
  73. Row 9 / Column 7 → 4 (Full House)
  74. Row 8 / Column 6 → 9 (Naked Single)
  75. Row 8 / Column 1 → 4 (Full House)
  76. Row 9 / Column 1 → 9 (Full House)
  77. Row 9 / Column 6 → 6 (Full House)
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