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

This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, Empty Rectangle, Continuous Nice Loop, Naked Pair, Naked Triple, undefined 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 1 / Column 4 → 8 (Hidden Single)
  2. Row 5 / Column 8 → 8 (Hidden Single)
  3. Row 4 / Column 5 → 5 (Hidden Single)
  4. Row 2 / Column 9 → 5 (Hidden Single)
  5. Row 3 / Column 8 → 9 (Hidden Single)
  6. Row 4 / Column 4 → 7 (Hidden Single)
  7. Row 9 / Column 5 → 7 (Hidden Single)
  8. Row 9 / Column 3 → 8 (Hidden Single)
  9. Row 8 / Column 5 → 8 (Hidden Single)
  10. Row 6 / Column 1 → 8 (Hidden Single)
  11. Row 7 / Column 7 → 8 (Hidden Single)
  12. Row 8 / Column 1 → 6 (Hidden Single)
  13. Row 2 / Column 5 → 6 (Hidden Single)
  14. Row 7 / Column 8 → 2 (Hidden Single)
  15. Row 1 / Column 8 → 4 (Naked Single)
  16. Row 9 / Column 8 → 6 (Full House)
  17. Row 4 / Column 2 → 6 (Hidden Single)
  18. Row 3 / Column 5 → 3 (Hidden Single)
  19. Row 7 / Column 4 → 6 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 2 in b2 => r5c4<>2
  21. Locked Candidates Type 1 (Pointing): 2 in b3 => r46c7<>2
  22. Locked Candidates Type 1 (Pointing): 3 in b3 => r8c7<>3
  23. Row 8 / Column 9 → 3 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 4 in b5 => r5c2<>4
  25. Locked Candidates Type 2 (Claiming): 1 in c5 => r5c46<>1
  26. Hidden Pair: 5,7 in r17c3 => r17c3<>1, r1c3<>2
  27. Empty Rectangle: 4 in b4 (r8c37) => r4c7<>4
  28. Continuous Nice Loop: 1/2 5= r3c2 =4= r9c2 =3= r9c6 =9= r5c6 =4= r3c6 =5= r3c2 =4 => r3c26,r9c26<>1, r3c2<>2
  29. Naked Pair: 4,5 in r3c26 => r3c14<>4
  30. Naked Triple: 1,3,7 in r137c1 => r2c1<>3, r4c1<>1
  31. Row 2 / Column 7 → 3 (Hidden Single)
  32. 2-String Kite: 1 in r3c1,r7c6 (connected by r1c6,r3c4) => r7c1<>1
  33. Locked Candidates Type 2 (Claiming): 1 in c1 => r1c2<>1
  34. XY-Wing: 5/7/1 in r1c36,r3c1 => r1c1,r3c4<>1
  35. Row 3 / Column 4 → 2 (Naked Single)
  36. Row 2 / Column 4 → 4 (Naked Single)
  37. Row 3 / Column 7 → 7 (Naked Single)
  38. Row 1 / Column 7 → 2 (Full House)
  39. Row 2 / Column 1 → 9 (Naked Single)
  40. Row 2 / Column 3 → 2 (Full House)
  41. Row 3 / Column 6 → 5 (Naked Single)
  42. Row 1 / Column 6 → 1 (Full House)
  43. Row 5 / Column 4 → 9 (Naked Single)
  44. Row 9 / Column 4 → 1 (Full House)
  45. Row 3 / Column 1 → 1 (Naked Single)
  46. Row 3 / Column 2 → 4 (Full House)
  47. Row 4 / Column 1 → 4 (Naked Single)
  48. Row 7 / Column 6 → 3 (Naked Single)
  49. Row 9 / Column 6 → 9 (Full House)
  50. Row 5 / Column 6 → 4 (Full House)
  51. Row 9 / Column 9 → 4 (Naked Single)
  52. Row 9 / Column 2 → 3 (Full House)
  53. Row 8 / Column 7 → 1 (Full House)
  54. Row 8 / Column 3 → 4 (Full House)
  55. Row 7 / Column 1 → 7 (Naked Single)
  56. Row 1 / Column 1 → 3 (Full House)
  57. Row 1 / Column 2 → 5 (Naked Single)
  58. Row 1 / Column 3 → 7 (Full House)
  59. Row 4 / Column 7 → 9 (Naked Single)
  60. Row 6 / Column 7 → 4 (Full House)
  61. Row 7 / Column 3 → 5 (Naked Single)
  62. Row 7 / Column 2 → 1 (Full House)
  63. Row 5 / Column 2 → 2 (Full House)
  64. Row 5 / Column 5 → 1 (Full House)
  65. Row 6 / Column 5 → 2 (Full House)
  66. Row 4 / Column 3 → 1 (Naked Single)
  67. Row 4 / Column 9 → 2 (Full House)
  68. Row 6 / Column 9 → 1 (Full House)
  69. Row 6 / Column 3 → 9 (Full House)
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