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

This Sudoku Puzzle has 59 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Pair, Locked Candidates Type 1 (Pointing), 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 6 → 5 (Naked Single)
  2. Row 2 / Column 8 → 1 (Naked Single)
  3. Row 2 / Column 4 → 8 (Naked Single)
  4. Row 2 / Column 2 → 3 (Full House)
  5. Row 5 / Column 1 → 9 (Hidden Single)
  6. Row 1 / Column 2 → 5 (Hidden Single)
  7. Row 4 / Column 8 → 5 (Hidden Single)
  8. Row 3 / Column 9 → 5 (Hidden Single)
  9. Row 5 / Column 4 → 5 (Hidden Single)
  10. Locked Pair: 3,6 in r78c6 => r46c6,r79c5,r8c4<>6
  11. Locked Candidates Type 1 (Pointing): 2 in b2 => r5c5<>2
  12. Row 5 / Column 5 → 7 (Naked Single)
  13. Row 7 / Column 5 → 5 (Naked Single)
  14. Row 9 / Column 5 → 1 (Naked Single)
  15. Row 8 / Column 4 → 7 (Naked Single)
  16. Row 8 / Column 8 → 4 (Naked Single)
  17. Row 9 / Column 3 → 5 (Hidden Single)
  18. Row 3 / Column 4 → 1 (Hidden Single)
  19. Row 8 / Column 9 → 1 (Hidden Single)
  20. Row 7 / Column 1 → 4 (Hidden Single)
  21. Row 7 / Column 3 → 3 (Hidden Single)
  22. Row 7 / Column 6 → 6 (Naked Single)
  23. Row 8 / Column 6 → 3 (Full House)
  24. Row 7 / Column 7 → 9 (Naked Single)
  25. Row 7 / Column 9 → 7 (Full House)
  26. Row 9 / Column 8 → 2 (Naked Single)
  27. Row 1 / Column 8 → 9 (Naked Single)
  28. Row 6 / Column 8 → 7 (Full House)
  29. Row 9 / Column 9 → 3 (Naked Single)
  30. Row 9 / Column 7 → 6 (Full House)
  31. Row 9 / Column 1 → 7 (Full House)
  32. Row 1 / Column 1 → 1 (Hidden Single)
  33. Row 4 / Column 9 → 9 (Hidden Single)
  34. Row 4 / Column 4 → 6 (Naked Single)
  35. Row 6 / Column 4 → 9 (Full House)
  36. Row 4 / Column 2 → 7 (Hidden Single)
  37. Row 5 / Column 7 → 3 (Hidden Single)
  38. Row 3 / Column 3 → 7 (Hidden Single)
  39. W-Wing: 4/2 in r5c9,r6c6 connected by 2 in r4c67 => r6c7<>4
  40. XY-Chain: 2 2- r3c7 -8- r3c1 -6- r1c3 -8- r5c3 -4- r5c9 -2 => r1c9,r46c7<>2
  41. Row 1 / Column 9 → 4 (Naked Single)
  42. Row 5 / Column 9 → 2 (Full House)
  43. Row 6 / Column 7 → 1 (Naked Single)
  44. Row 4 / Column 7 → 4 (Full House)
  45. Row 5 / Column 2 → 8 (Naked Single)
  46. Row 5 / Column 3 → 4 (Full House)
  47. Row 4 / Column 3 → 1 (Naked Single)
  48. Row 4 / Column 6 → 2 (Full House)
  49. Row 6 / Column 6 → 4 (Full House)
  50. Row 8 / Column 2 → 6 (Naked Single)
  51. Row 6 / Column 2 → 2 (Full House)
  52. Row 6 / Column 3 → 6 (Full House)
  53. Row 8 / Column 1 → 8 (Full House)
  54. Row 1 / Column 3 → 8 (Full House)
  55. Row 3 / Column 1 → 6 (Full House)
  56. Row 1 / Column 7 → 2 (Naked Single)
  57. Row 1 / Column 5 → 6 (Full House)
  58. Row 3 / Column 5 → 2 (Full House)
  59. Row 3 / Column 7 → 8 (Full House)
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