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

This Sudoku Puzzle has 59 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Turbot Fish, undefined, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 6 / Column 3 → 8 (Hidden Single)
  2. Row 5 / Column 7 → 7 (Hidden Single)
  3. Row 5 / Column 6 → 1 (Hidden Single)
  4. Row 1 / Column 7 → 8 (Hidden Single)
  5. Row 3 / Column 5 → 2 (Hidden Single)
  6. Row 8 / Column 4 → 2 (Hidden Single)
  7. Row 7 / Column 8 → 1 (Hidden Single)
  8. Row 7 / Column 6 → 4 (Hidden Single)
  9. Row 7 / Column 5 → 9 (Naked Single)
  10. Row 7 / Column 4 → 3 (Naked Single)
  11. Row 9 / Column 4 → 7 (Full House)
  12. Row 7 / Column 7 → 6 (Naked Single)
  13. Row 7 / Column 1 → 5 (Full House)
  14. Row 1 / Column 9 → 2 (Hidden Single)
  15. Row 4 / Column 7 → 2 (Hidden Single)
  16. Row 3 / Column 4 → 6 (Hidden Single)
  17. Row 5 / Column 4 → 9 (Full House)
  18. Row 8 / Column 8 → 5 (Hidden Single)
  19. Row 2 / Column 9 → 6 (Hidden Single)
  20. Row 3 / Column 9 → 1 (Hidden Single)
  21. Locked Candidates Type 1 (Pointing): 3 in b4 => r1c1<>3
  22. Locked Candidates Type 1 (Pointing): 4 in b6 => r9c9<>4
  23. Locked Candidates Type 2 (Claiming): 6 in r5 => r46c1<>6
  24. Turbot Fish: 9 r1c8 =9= r2c7 -9- r8c7 =9= r8c1 => r1c1<>9
  25. Row 1 / Column 1 → 4 (Naked Single)
  26. Row 5 / Column 1 → 6 (Naked Single)
  27. Row 9 / Column 3 → 6 (Hidden Single)
  28. Row 2 / Column 3 → 1 (Hidden Single)
  29. Locked Candidates Type 1 (Pointing): 9 in b1 => r9c2<>9
  30. W-Wing: 9/3 in r1c8,r3c6 connected by 3 in r2c67 => r1c6<>9
  31. Row 1 / Column 8 → 9 (Hidden Single)
  32. Row 2 / Column 7 → 3 (Full House)
  33. Row 6 / Column 9 → 9 (Hidden Single)
  34. Row 9 / Column 9 → 3 (Naked Single)
  35. Bivalue Universal Grave + 1 => r4c2<>1, r4c2<>5
  36. Row 4 / Column 2 → 4 (Naked Single)
  37. Row 4 / Column 5 → 6 (Naked Single)
  38. Row 6 / Column 5 → 4 (Full House)
  39. Row 4 / Column 9 → 5 (Naked Single)
  40. Row 5 / Column 9 → 4 (Full House)
  41. Row 5 / Column 3 → 5 (Full House)
  42. Row 6 / Column 2 → 7 (Naked Single)
  43. Row 9 / Column 2 → 1 (Naked Single)
  44. Row 4 / Column 8 → 3 (Naked Single)
  45. Row 4 / Column 1 → 1 (Full House)
  46. Row 6 / Column 1 → 3 (Full House)
  47. Row 6 / Column 8 → 6 (Full House)
  48. Row 1 / Column 3 → 3 (Naked Single)
  49. Row 1 / Column 6 → 5 (Full House)
  50. Row 3 / Column 2 → 9 (Naked Single)
  51. Row 2 / Column 2 → 5 (Full House)
  52. Row 3 / Column 3 → 7 (Full House)
  53. Row 2 / Column 6 → 9 (Full House)
  54. Row 3 / Column 6 → 3 (Full House)
  55. Row 8 / Column 3 → 4 (Full House)
  56. Row 9 / Column 1 → 9 (Naked Single)
  57. Row 8 / Column 1 → 7 (Full House)
  58. Row 8 / Column 7 → 9 (Full House)
  59. Row 9 / Column 7 → 4 (Full House)
Show More...