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

This Sudoku Puzzle has 59 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Single, Full House, Skyscraper techniques.

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

Solution Steps:

  1. Row 3 / Column 9 → 4 (Hidden Single)
  2. Row 1 / Column 6 → 4 (Hidden Single)
  3. Row 4 / Column 4 → 4 (Hidden Single)
  4. Row 7 / Column 8 → 4 (Hidden Single)
  5. Row 5 / Column 1 → 4 (Hidden Single)
  6. Row 8 / Column 8 → 8 (Hidden Single)
  7. Row 6 / Column 2 → 8 (Hidden Single)
  8. Locked Candidates Type 1 (Pointing): 3 in b2 => r2c2<>3
  9. Locked Candidates Type 1 (Pointing): 5 in b3 => r2c2<>5
  10. Row 2 / Column 2 → 2 (Naked Single)
  11. Row 8 / Column 2 → 7 (Naked Single)
  12. Row 8 / Column 3 → 9 (Naked Single)
  13. Row 8 / Column 4 → 6 (Naked Single)
  14. Row 8 / Column 6 → 2 (Full House)
  15. Row 7 / Column 1 → 2 (Hidden Single)
  16. Row 6 / Column 9 → 2 (Hidden Single)
  17. Row 5 / Column 5 → 2 (Hidden Single)
  18. Row 7 / Column 3 → 8 (Hidden Single)
  19. Row 1 / Column 7 → 2 (Hidden Single)
  20. Row 1 / Column 1 → 8 (Hidden Single)
  21. Row 3 / Column 7 → 8 (Hidden Single)
  22. Row 1 / Column 3 → 3 (Hidden Single)
  23. Row 9 / Column 3 → 5 (Naked Single)
  24. Row 9 / Column 1 → 3 (Full House)
  25. Row 3 / Column 3 → 6 (Naked Single)
  26. Row 3 / Column 1 → 5 (Full House)
  27. Row 3 / Column 5 → 9 (Full House)
  28. Row 2 / Column 4 → 3 (Naked Single)
  29. Row 9 / Column 5 → 7 (Naked Single)
  30. Row 7 / Column 4 → 9 (Naked Single)
  31. Row 6 / Column 4 → 7 (Full House)
  32. Row 7 / Column 5 → 5 (Naked Single)
  33. Row 7 / Column 6 → 3 (Full House)
  34. Row 6 / Column 3 → 1 (Naked Single)
  35. Row 5 / Column 3 → 7 (Full House)
  36. Row 4 / Column 7 → 7 (Hidden Single)
  37. Row 7 / Column 7 → 1 (Naked Single)
  38. Row 7 / Column 9 → 7 (Full House)
  39. Row 4 / Column 2 → 3 (Hidden Single)
  40. Row 5 / Column 2 → 5 (Full House)
  41. Row 5 / Column 7 → 3 (Hidden Single)
  42. Row 2 / Column 9 → 5 (Hidden Single)
  43. Skyscraper: 1 in r1c5,r5c6 (connected by r15c9) => r2c6,r4c5<>1
  44. Row 2 / Column 6 → 6 (Naked Single)
  45. Row 1 / Column 5 → 1 (Full House)
  46. Row 4 / Column 5 → 6 (Full House)
  47. Row 1 / Column 9 → 6 (Full House)
  48. Row 2 / Column 7 → 9 (Naked Single)
  49. Row 2 / Column 8 → 1 (Full House)
  50. Row 9 / Column 7 → 6 (Full House)
  51. Row 9 / Column 9 → 9 (Full House)
  52. Row 5 / Column 9 → 1 (Full House)
  53. Row 5 / Column 6 → 9 (Full House)
  54. Row 4 / Column 1 → 9 (Naked Single)
  55. Row 6 / Column 1 → 6 (Full House)
  56. Row 6 / Column 6 → 5 (Naked Single)
  57. Row 4 / Column 6 → 1 (Full House)
  58. Row 4 / Column 8 → 5 (Full House)
  59. Row 6 / Column 8 → 9 (Full House)
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