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

This Sudoku Puzzle has 49 steps and it is solved using Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Skyscraper, Naked Single techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 3 / Column 1 → 2 (Hidden Single)
  2. Row 5 / Column 1 → 7 (Hidden Single)
  3. Row 1 / Column 7 → 4 (Hidden Single)
  4. Row 7 / Column 9 → 7 (Hidden Single)
  5. Row 9 / Column 3 → 4 (Hidden Single)
  6. Row 3 / Column 8 → 7 (Hidden Single)
  7. Row 6 / Column 8 → 2 (Hidden Single)
  8. Row 3 / Column 9 → 8 (Hidden Single)
  9. Row 1 / Column 1 → 8 (Hidden Single)
  10. Row 5 / Column 9 → 4 (Hidden Single)
  11. Row 4 / Column 1 → 4 (Hidden Single)
  12. Row 8 / Column 4 → 4 (Hidden Single)
  13. Row 2 / Column 5 → 4 (Hidden Single)
  14. Row 7 / Column 2 → 2 (Hidden Single)
  15. Row 9 / Column 9 → 2 (Hidden Single)
  16. Row 1 / Column 3 → 3 (Hidden Single)
  17. Row 6 / Column 9 → 1 (Hidden Single)
  18. Row 4 / Column 2 → 3 (Hidden Single)
  19. Row 7 / Column 1 → 5 (Hidden Single)
  20. Row 7 / Column 5 → 8 (Hidden Single)
  21. Row 8 / Column 2 → 8 (Hidden Single)
  22. Row 5 / Column 8 → 9 (Hidden Single)
  23. Row 5 / Column 2 → 5 (Full House)
  24. Row 9 / Column 1 → 3 (Hidden Single)
  25. Locked Candidates Type 1 (Pointing): 1 in b1 => r2c8<>1
  26. Skyscraper: 1 in r1c8,r7c7 (connected by r17c4) => r3c7,r8c8<>1
  27. Row 3 / Column 5 → 1 (Hidden Single)
  28. Row 1 / Column 4 → 9 (Full House)
  29. Row 8 / Column 5 → 9 (Full House)
  30. Row 7 / Column 4 → 1 (Full House)
  31. Row 1 / Column 9 → 5 (Naked Single)
  32. Row 1 / Column 8 → 1 (Full House)
  33. Row 4 / Column 9 → 6 (Naked Single)
  34. Row 4 / Column 8 → 5 (Full House)
  35. Row 8 / Column 9 → 3 (Naked Single)
  36. Row 2 / Column 9 → 9 (Full House)
  37. Row 8 / Column 8 → 6 (Naked Single)
  38. Row 2 / Column 8 → 3 (Full House)
  39. Row 3 / Column 7 → 6 (Full House)
  40. Row 8 / Column 1 → 1 (Full House)
  41. Row 3 / Column 3 → 9 (Full House)
  42. Row 7 / Column 3 → 6 (Full House)
  43. Row 7 / Column 7 → 9 (Full House)
  44. Row 9 / Column 2 → 9 (Full House)
  45. Row 9 / Column 7 → 1 (Full House)
  46. Row 2 / Column 1 → 6 (Naked Single)
  47. Row 2 / Column 2 → 1 (Full House)
  48. Row 6 / Column 2 → 6 (Full House)
  49. Row 6 / Column 1 → 9 (Full House)
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