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

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

Try To Solve This Puzzle

Solution Steps:

  1. Row 4 / Column 8 → 8 (Hidden Single)
  2. Row 1 / Column 4 → 6 (Hidden Single)
  3. Row 5 / Column 5 → 7 (Hidden Single)
  4. Row 8 / Column 7 → 3 (Hidden Single)
  5. Row 4 / Column 6 → 5 (Hidden Single)
  6. Row 9 / Column 9 → 7 (Hidden Single)
  7. Row 4 / Column 3 → 7 (Hidden Single)
  8. Row 3 / Column 1 → 7 (Hidden Single)
  9. Row 6 / Column 8 → 7 (Hidden Single)
  10. Row 8 / Column 5 → 5 (Hidden Single)
  11. Row 7 / Column 7 → 5 (Hidden Single)
  12. Row 7 / Column 9 → 8 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 1 in b2 => r9c5<>1
  14. Locked Candidates Type 1 (Pointing): 4 in b5 => r89c4<>4
  15. Row 8 / Column 8 → 4 (Hidden Single)
  16. Row 5 / Column 8 → 9 (Naked Single)
  17. Row 2 / Column 8 → 1 (Full House)
  18. Row 5 / Column 9 → 2 (Naked Single)
  19. Row 1 / Column 9 → 9 (Naked Single)
  20. Row 3 / Column 7 → 2 (Full House)
  21. Row 8 / Column 9 → 1 (Full House)
  22. Row 9 / Column 7 → 9 (Full House)
  23. Row 9 / Column 4 → 1 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 1 in b1 => r6c3<>1
  25. X-Wing: 2 r48 c24 => r26c2,r6c4<>2
  26. X-Wing: 9 r37 c35 => r2c35<>9
  27. Row 2 / Column 5 → 2 (Naked Single)
  28. W-Wing: 4/9 in r6c4,r7c3 connected by 9 in r8c24 => r6c3<>4
  29. Locked Candidates Type 1 (Pointing): 4 in b4 => r5c7<>4
  30. Row 5 / Column 7 → 6 (Naked Single)
  31. Row 5 / Column 2 → 5 (Naked Single)
  32. Row 2 / Column 1 → 5 (Hidden Single)
  33. Bivalue Universal Grave + 1 => r1c3<>1, r1c3<>2
  34. Row 1 / Column 3 → 3 (Naked Single)
  35. Row 1 / Column 1 → 2 (Naked Single)
  36. Row 1 / Column 6 → 8 (Naked Single)
  37. Row 1 / Column 5 → 1 (Full House)
  38. Row 2 / Column 3 → 6 (Naked Single)
  39. Row 5 / Column 3 → 4 (Naked Single)
  40. Row 5 / Column 1 → 3 (Full House)
  41. Row 9 / Column 1 → 4 (Full House)
  42. Row 9 / Column 6 → 2 (Naked Single)
  43. Row 9 / Column 5 → 8 (Full House)
  44. Row 3 / Column 5 → 9 (Naked Single)
  45. Row 2 / Column 6 → 3 (Full House)
  46. Row 2 / Column 2 → 9 (Full House)
  47. Row 6 / Column 6 → 9 (Full House)
  48. Row 3 / Column 3 → 1 (Full House)
  49. Row 7 / Column 5 → 4 (Full House)
  50. Row 7 / Column 3 → 9 (Full House)
  51. Row 6 / Column 3 → 2 (Full House)
  52. Row 8 / Column 4 → 9 (Full House)
  53. Row 8 / Column 2 → 2 (Full House)
  54. Row 6 / Column 4 → 4 (Naked Single)
  55. Row 4 / Column 4 → 2 (Full House)
  56. Row 4 / Column 2 → 1 (Naked Single)
  57. Row 4 / Column 7 → 4 (Full House)
  58. Row 6 / Column 7 → 1 (Full House)
  59. Row 6 / Column 2 → 6 (Full House)
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