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

This Sudoku Puzzle has 57 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Skyscraper, Uniqueness Test 1 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 3 / Column 3 → 8 (Naked Single)
  2. Row 3 / Column 6 → 1 (Naked Single)
  3. Row 3 / Column 9 → 4 (Full House)
  4. Row 6 / Column 3 → 5 (Naked Single)
  5. Row 9 / Column 3 → 2 (Full House)
  6. Row 2 / Column 6 → 8 (Naked Single)
  7. Row 5 / Column 1 → 7 (Hidden Single)
  8. Row 9 / Column 2 → 3 (Hidden Single)
  9. Row 7 / Column 7 → 4 (Hidden Single)
  10. Row 4 / Column 7 → 8 (Naked Single)
  11. Row 1 / Column 7 → 1 (Full House)
  12. Row 1 / Column 6 → 9 (Hidden Single)
  13. Row 6 / Column 2 → 8 (Hidden Single)
  14. Row 2 / Column 2 → 1 (Hidden Single)
  15. Row 1 / Column 5 → 5 (Hidden Single)
  16. Row 8 / Column 6 → 5 (Hidden Single)
  17. Row 4 / Column 4 → 5 (Hidden Single)
  18. Row 9 / Column 1 → 5 (Hidden Single)
  19. Row 8 / Column 5 → 6 (Hidden Single)
  20. Row 4 / Column 5 → 9 (Hidden Single)
  21. Row 9 / Column 4 → 9 (Hidden Single)
  22. Locked Candidates Type 1 (Pointing): 4 in b2 => r2c1<>4
  23. Locked Candidates Type 1 (Pointing): 2 in b4 => r1c2<>2
  24. Locked Candidates Type 2 (Claiming): 8 in r9 => r8c89<>8
  25. Naked Pair: 2,6 in r24c9 => r15c9<>2, r15c9<>6
  26. Row 1 / Column 9 → 8 (Naked Single)
  27. Row 9 / Column 8 → 8 (Hidden Single)
  28. Skyscraper: 1 in r6c8,r9c9 (connected by r69c5) => r5c9,r8c8<>1
  29. Row 5 / Column 9 → 3 (Naked Single)
  30. Row 8 / Column 8 → 3 (Naked Single)
  31. Row 5 / Column 6 → 6 (Naked Single)
  32. Row 6 / Column 6 → 3 (Full House)
  33. Skyscraper: 6 in r2c9,r6c8 (connected by r26c1) => r1c8,r4c9<>6
  34. Row 1 / Column 8 → 2 (Naked Single)
  35. Row 2 / Column 9 → 6 (Full House)
  36. Row 4 / Column 9 → 2 (Naked Single)
  37. Row 2 / Column 1 → 2 (Naked Single)
  38. Row 5 / Column 2 → 2 (Hidden Single)
  39. Uniqueness Test 1: 1/8 in r7c14,r8c14 => r8c4<>1, r8c4<>8
  40. Row 8 / Column 4 → 7 (Naked Single)
  41. Row 2 / Column 4 → 4 (Naked Single)
  42. Row 2 / Column 5 → 7 (Full House)
  43. Row 8 / Column 9 → 1 (Naked Single)
  44. Row 8 / Column 1 → 8 (Full House)
  45. Row 9 / Column 9 → 7 (Full House)
  46. Row 9 / Column 5 → 1 (Full House)
  47. Row 7 / Column 1 → 1 (Full House)
  48. Row 6 / Column 5 → 4 (Full House)
  49. Row 5 / Column 4 → 1 (Full House)
  50. Row 7 / Column 4 → 8 (Full House)
  51. Row 5 / Column 8 → 4 (Full House)
  52. Row 6 / Column 1 → 6 (Naked Single)
  53. Row 1 / Column 1 → 4 (Full House)
  54. Row 4 / Column 2 → 4 (Full House)
  55. Row 4 / Column 8 → 6 (Full House)
  56. Row 6 / Column 8 → 1 (Full House)
  57. Row 1 / Column 2 → 6 (Full House)
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