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

This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Swordfish, Skyscraper, undefined, Uniqueness Test 2, Naked Single, Full House 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 2 / Column 1 → 4 (Hidden Single)
  2. Row 5 / Column 8 → 4 (Hidden Single)
  3. Row 7 / Column 6 → 2 (Hidden Single)
  4. Row 3 / Column 9 → 8 (Hidden Single)
  5. Row 9 / Column 9 → 2 (Hidden Single)
  6. Row 9 / Column 2 → 4 (Hidden Single)
  7. Row 2 / Column 3 → 8 (Hidden Single)
  8. Row 3 / Column 4 → 4 (Hidden Single)
  9. Row 1 / Column 9 → 4 (Hidden Single)
  10. Row 2 / Column 7 → 6 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 7 in b3 => r3c5<>7
  12. Locked Candidates Type 2 (Claiming): 5 in r2 => r1c46,r3c5<>5
  13. Swordfish: 3 r157 c347 => r38c3,r4c4<>3
  14. Skyscraper: 8 in r6c1,r7c2 (connected by r67c4) => r5c2,r8c1<>8
  15. Row 7 / Column 2 → 8 (Hidden Single)
  16. Row 6 / Column 1 → 8 (Hidden Single)
  17. Row 8 / Column 6 → 8 (Hidden Single)
  18. Row 5 / Column 4 → 8 (Hidden Single)
  19. Row 5 / Column 7 → 3 (Hidden Single)
  20. Row 1 / Column 4 → 3 (Hidden Single)
  21. Row 4 / Column 5 → 3 (Hidden Single)
  22. Row 8 / Column 9 → 3 (Hidden Single)
  23. Row 7 / Column 3 → 3 (Hidden Single)
  24. Row 3 / Column 1 → 3 (Hidden Single)
  25. Row 9 / Column 3 → 9 (Hidden Single)
  26. Row 3 / Column 3 → 2 (Hidden Single)
  27. Row 4 / Column 1 → 2 (Hidden Single)
  28. Row 8 / Column 3 → 7 (Hidden Single)
  29. Row 6 / Column 8 → 2 (Hidden Single)
  30. Locked Candidates Type 2 (Claiming): 5 in c9 => r4c8,r6c7<>5
  31. Locked Candidates Type 2 (Claiming): 7 in c9 => r4c8,r6c7<>7
  32. W-Wing: 7/5 in r2c5,r9c7 connected by 5 in r8c58 => r9c5<>7
  33. Locked Candidates Type 1 (Pointing): 7 in b8 => r46c4<>7
  34. W-Wing: 1/9 in r3c5,r4c8 connected by 9 in r6c57 => r3c8<>1
  35. Uniqueness Test 2: 1/6 in r8c15,r9c15 => r26c5,r9c4<>5
  36. Row 2 / Column 5 → 7 (Naked Single)
  37. Row 2 / Column 6 → 5 (Full House)
  38. Row 6 / Column 9 → 7 (Hidden Single)
  39. Row 4 / Column 9 → 5 (Full House)
  40. Row 6 / Column 4 → 5 (Hidden Single)
  41. W-Wing: 6/1 in r4c4,r6c3 connected by 1 in r5c36 => r4c2,r6c5<>6
  42. Row 4 / Column 2 → 7 (Naked Single)
  43. Row 5 / Column 2 → 5 (Naked Single)
  44. Row 3 / Column 2 → 9 (Naked Single)
  45. Row 1 / Column 2 → 6 (Full House)
  46. Row 1 / Column 3 → 5 (Full House)
  47. Row 5 / Column 3 → 1 (Naked Single)
  48. Row 5 / Column 6 → 7 (Full House)
  49. Row 6 / Column 3 → 6 (Full House)
  50. Row 3 / Column 5 → 1 (Naked Single)
  51. Row 1 / Column 6 → 9 (Full House)
  52. Row 1 / Column 8 → 1 (Full House)
  53. Row 4 / Column 6 → 1 (Full House)
  54. Row 6 / Column 5 → 9 (Naked Single)
  55. Row 4 / Column 4 → 6 (Full House)
  56. Row 4 / Column 8 → 9 (Full House)
  57. Row 6 / Column 7 → 1 (Full House)
  58. Row 7 / Column 4 → 7 (Naked Single)
  59. Row 9 / Column 4 → 1 (Full House)
  60. Row 7 / Column 7 → 9 (Naked Single)
  61. Row 7 / Column 8 → 6 (Full House)
  62. Row 9 / Column 1 → 6 (Naked Single)
  63. Row 8 / Column 1 → 1 (Full House)
  64. Row 8 / Column 8 → 5 (Naked Single)
  65. Row 3 / Column 8 → 7 (Full House)
  66. Row 8 / Column 5 → 6 (Full House)
  67. Row 9 / Column 5 → 5 (Full House)
  68. Row 9 / Column 7 → 7 (Full House)
  69. Row 3 / Column 7 → 5 (Full House)
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