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

This Sudoku Puzzle has 52 steps and it is solved using Full House, Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Skyscraper, undefined, Naked Pair techniques.

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

Solution Steps:

  1. Row 2 / Column 2 → 5 (Full House)
  2. Row 6 / Column 8 → 8 (Naked Single)
  3. Row 6 / Column 7 → 7 (Full House)
  4. Row 3 / Column 3 → 2 (Hidden Single)
  5. Row 4 / Column 2 → 6 (Hidden Single)
  6. Row 5 / Column 1 → 8 (Hidden Single)
  7. Row 1 / Column 3 → 1 (Hidden Single)
  8. Row 6 / Column 2 → 2 (Hidden Single)
  9. Row 7 / Column 3 → 6 (Hidden Single)
  10. Locked Candidates Type 1 (Pointing): 7 in b1 => r79c1<>7
  11. Locked Candidates Type 1 (Pointing): 5 in b2 => r6c6<>5
  12. Row 6 / Column 6 → 4 (Naked Single)
  13. Row 5 / Column 2 → 4 (Hidden Single)
  14. Row 9 / Column 2 → 7 (Full House)
  15. Row 7 / Column 4 → 4 (Hidden Single)
  16. Row 9 / Column 1 → 4 (Hidden Single)
  17. Row 4 / Column 4 → 8 (Hidden Single)
  18. Skyscraper: 9 in r7c1,r8c4 (connected by r6c14) => r7c5<>9
  19. X-Wing: 9 c35 r49 => r9c79<>9
  20. Naked Pair: 3,5 in r19c9 => r37c9<>5
  21. W-Wing: 8/9 in r7c7,r9c5 connected by 9 in r8c49 => r7c56,r9c7<>8
  22. Row 9 / Column 7 → 3 (Naked Single)
  23. Row 1 / Column 7 → 6 (Naked Single)
  24. Row 9 / Column 9 → 5 (Naked Single)
  25. Row 1 / Column 1 → 7 (Naked Single)
  26. Row 3 / Column 1 → 6 (Full House)
  27. Row 3 / Column 7 → 9 (Naked Single)
  28. Row 7 / Column 7 → 8 (Full House)
  29. Row 1 / Column 9 → 3 (Naked Single)
  30. Row 7 / Column 8 → 1 (Naked Single)
  31. Row 9 / Column 3 → 9 (Naked Single)
  32. Row 7 / Column 1 → 5 (Full House)
  33. Row 9 / Column 5 → 8 (Full House)
  34. Row 6 / Column 1 → 9 (Full House)
  35. Row 6 / Column 4 → 5 (Full House)
  36. Row 3 / Column 9 → 1 (Naked Single)
  37. Row 4 / Column 3 → 7 (Naked Single)
  38. Row 5 / Column 3 → 5 (Full House)
  39. Row 5 / Column 4 → 7 (Full House)
  40. Row 8 / Column 4 → 9 (Full House)
  41. Row 8 / Column 9 → 7 (Full House)
  42. Row 7 / Column 9 → 9 (Full House)
  43. Row 1 / Column 5 → 4 (Naked Single)
  44. Row 4 / Column 6 → 2 (Naked Single)
  45. Row 4 / Column 5 → 9 (Full House)
  46. Row 1 / Column 8 → 5 (Naked Single)
  47. Row 1 / Column 6 → 8 (Full House)
  48. Row 3 / Column 8 → 4 (Full House)
  49. Row 3 / Column 5 → 7 (Naked Single)
  50. Row 3 / Column 6 → 5 (Full House)
  51. Row 7 / Column 6 → 7 (Full House)
  52. Row 7 / Column 5 → 2 (Full House)
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