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

This Sudoku Puzzle has 60 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Uniqueness Test 1, undefined techniques.

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

Solution Steps:

  1. Row 2 / Column 4 → 1 (Hidden Single)
  2. Row 4 / Column 2 → 1 (Hidden Single)
  3. Row 5 / Column 5 → 6 (Hidden Single)
  4. Row 1 / Column 3 → 6 (Hidden Single)
  5. Row 8 / Column 3 → 1 (Hidden Single)
  6. Row 9 / Column 6 → 1 (Hidden Single)
  7. Row 3 / Column 4 → 3 (Hidden Single)
  8. Row 2 / Column 2 → 9 (Hidden Single)
  9. Row 1 / Column 2 → 8 (Hidden Single)
  10. Row 3 / Column 3 → 2 (Naked Single)
  11. Row 8 / Column 2 → 5 (Naked Single)
  12. Row 3 / Column 2 → 4 (Naked Single)
  13. Row 7 / Column 2 → 3 (Naked Single)
  14. Row 6 / Column 2 → 2 (Full House)
  15. Row 7 / Column 1 → 8 (Full House)
  16. Row 3 / Column 1 → 7 (Naked Single)
  17. Row 3 / Column 5 → 9 (Naked Single)
  18. Row 7 / Column 5 → 5 (Naked Single)
  19. Row 9 / Column 5 → 4 (Naked Single)
  20. Row 1 / Column 5 → 2 (Full House)
  21. Row 7 / Column 9 → 1 (Hidden Single)
  22. Row 1 / Column 4 → 7 (Hidden Single)
  23. Row 1 / Column 6 → 4 (Full House)
  24. Row 5 / Column 3 → 8 (Hidden Single)
  25. Locked Candidates Type 1 (Pointing): 9 in b9 => r5c7<>9
  26. Uniqueness Test 1: 3/5 in r2c13,r6c13 => r6c1<>3, r6c1<>5
  27. XY-Chain: 7 7- r7c8 -6- r3c8 -8- r9c8 -5- r9c7 -9- r9c4 -8- r8c6 -7 => r7c6,r8c789<>7
  28. Row 7 / Column 6 → 9 (Naked Single)
  29. Row 6 / Column 6 → 3 (Naked Single)
  30. Row 9 / Column 4 → 8 (Naked Single)
  31. Row 8 / Column 6 → 7 (Full House)
  32. Row 5 / Column 6 → 2 (Naked Single)
  33. Row 4 / Column 6 → 8 (Full House)
  34. Row 6 / Column 3 → 5 (Naked Single)
  35. Row 2 / Column 3 → 3 (Full House)
  36. Row 2 / Column 1 → 5 (Full House)
  37. Row 9 / Column 8 → 5 (Naked Single)
  38. Row 9 / Column 7 → 9 (Full House)
  39. Row 6 / Column 9 → 7 (Hidden Single)
  40. Row 5 / Column 1 → 3 (Hidden Single)
  41. Row 4 / Column 8 → 3 (Hidden Single)
  42. Row 6 / Column 4 → 9 (Hidden Single)
  43. Row 5 / Column 9 → 9 (Hidden Single)
  44. Row 4 / Column 7 → 2 (Hidden Single)
  45. Row 8 / Column 7 → 4 (Naked Single)
  46. Row 2 / Column 7 → 7 (Naked Single)
  47. Row 2 / Column 8 → 4 (Full House)
  48. Row 5 / Column 7 → 5 (Naked Single)
  49. Row 7 / Column 7 → 6 (Full House)
  50. Row 5 / Column 4 → 4 (Full House)
  51. Row 7 / Column 8 → 7 (Full House)
  52. Row 4 / Column 4 → 5 (Full House)
  53. Row 8 / Column 9 → 8 (Naked Single)
  54. Row 8 / Column 8 → 2 (Full House)
  55. Row 6 / Column 8 → 6 (Naked Single)
  56. Row 3 / Column 8 → 8 (Full House)
  57. Row 3 / Column 9 → 6 (Full House)
  58. Row 4 / Column 9 → 4 (Full House)
  59. Row 6 / Column 1 → 4 (Full House)
  60. Row 4 / Column 1 → 6 (Full House)
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