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

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

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

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 3 in b6 => r123c9<>3
  2. Locked Triple: 6,7,8 in r123c9 => r13c7,r8c9<>6, r123c7,r8c9<>8
  3. Row 8 / Column 9 → 5 (Naked Single)
  4. Row 8 / Column 2 → 9 (Naked Single)
  5. Row 4 / Column 7 → 5 (Hidden Single)
  6. Row 4 / Column 1 → 2 (Naked Single)
  7. Row 1 / Column 7 → 9 (Hidden Single)
  8. Row 2 / Column 7 → 3 (Naked Single)
  9. Row 3 / Column 7 → 1 (Naked Single)
  10. Row 2 / Column 1 → 9 (Hidden Single)
  11. Row 9 / Column 5 → 9 (Hidden Single)
  12. Row 3 / Column 2 → 2 (Hidden Single)
  13. Row 6 / Column 9 → 2 (Hidden Single)
  14. Row 5 / Column 9 → 3 (Full House)
  15. Row 1 / Column 4 → 3 (Hidden Single)
  16. Row 1 / Column 2 → 5 (Naked Single)
  17. Row 6 / Column 2 → 3 (Full House)
  18. Row 2 / Column 3 → 8 (Naked Single)
  19. Row 1 / Column 3 → 6 (Naked Single)
  20. Row 3 / Column 3 → 3 (Full House)
  21. Row 2 / Column 9 → 7 (Naked Single)
  22. Row 1 / Column 9 → 8 (Naked Single)
  23. Row 3 / Column 9 → 6 (Full House)
  24. Row 2 / Column 4 → 5 (Naked Single)
  25. Row 2 / Column 5 → 2 (Full House)
  26. Row 1 / Column 5 → 1 (Naked Single)
  27. Row 1 / Column 6 → 4 (Full House)
  28. Row 6 / Column 4 → 1 (Naked Single)
  29. Row 6 / Column 3 → 5 (Full House)
  30. Row 5 / Column 1 → 1 (Full House)
  31. Row 5 / Column 4 → 6 (Naked Single)
  32. Row 9 / Column 4 → 8 (Naked Single)
  33. Row 8 / Column 1 → 8 (Naked Single)
  34. Row 5 / Column 5 → 5 (Naked Single)
  35. Row 5 / Column 6 → 2 (Full House)
  36. Row 4 / Column 4 → 7 (Naked Single)
  37. Row 7 / Column 4 → 4 (Full House)
  38. Row 4 / Column 6 → 8 (Full House)
  39. Row 9 / Column 7 → 2 (Naked Single)
  40. Row 7 / Column 1 → 5 (Naked Single)
  41. Row 9 / Column 1 → 3 (Full House)
  42. Row 8 / Column 7 → 6 (Naked Single)
  43. Row 7 / Column 7 → 8 (Full House)
  44. Row 7 / Column 5 → 6 (Naked Single)
  45. Row 7 / Column 3 → 2 (Full House)
  46. Row 3 / Column 6 → 7 (Naked Single)
  47. Row 3 / Column 5 → 8 (Full House)
  48. Row 8 / Column 5 → 7 (Full House)
  49. Row 9 / Column 3 → 1 (Naked Single)
  50. Row 8 / Column 3 → 4 (Full House)
  51. Row 8 / Column 6 → 1 (Full House)
  52. Row 9 / Column 6 → 5 (Full House)
Show More...