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

This Sudoku Puzzle has 63 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Naked Triple, Skyscraper, Locked Candidates Type 2 (Claiming), undefined techniques.

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

Solution Steps:

  1. Row 4 / Column 7 → 1 (Naked Single)
  2. Row 1 / Column 9 → 9 (Hidden Single)
  3. Row 2 / Column 2 → 9 (Hidden Single)
  4. Row 6 / Column 5 → 9 (Hidden Single)
  5. Row 8 / Column 5 → 3 (Hidden Single)
  6. Row 5 / Column 7 → 3 (Hidden Single)
  7. Row 5 / Column 9 → 4 (Naked Single)
  8. Row 9 / Column 9 → 1 (Naked Single)
  9. Row 8 / Column 9 → 8 (Naked Single)
  10. Row 2 / Column 9 → 5 (Naked Single)
  11. Row 3 / Column 9 → 3 (Full House)
  12. Row 9 / Column 7 → 9 (Hidden Single)
  13. Row 6 / Column 4 → 4 (Hidden Single)
  14. Row 8 / Column 2 → 1 (Hidden Single)
  15. Row 7 / Column 6 → 8 (Hidden Single)
  16. Row 6 / Column 8 → 5 (Hidden Single)
  17. Row 4 / Column 8 → 2 (Full House)
  18. Row 9 / Column 4 → 5 (Hidden Single)
  19. Row 4 / Column 6 → 5 (Hidden Single)
  20. Row 2 / Column 4 → 7 (Hidden Single)
  21. Row 9 / Column 5 → 7 (Hidden Single)
  22. Row 2 / Column 8 → 1 (Hidden Single)
  23. Locked Candidates Type 1 (Pointing): 2 in b5 => r5c13<>2
  24. Locked Candidates Type 1 (Pointing): 2 in b8 => r5c6<>2
  25. Locked Candidates Type 1 (Pointing): 4 in b8 => r1c6<>4
  26. Locked Candidates Type 1 (Pointing): 6 in b9 => r8c13<>6
  27. Naked Triple: 2,6,8 in r2c13,r3c2 => r1c13<>6, r1c1<>8
  28. Skyscraper: 8 in r2c1,r4c2 (connected by r24c5) => r3c2,r5c1<>8
  29. Row 4 / Column 2 → 8 (Hidden Single)
  30. Row 4 / Column 5 → 6 (Full House)
  31. Row 5 / Column 6 → 1 (Naked Single)
  32. Row 1 / Column 6 → 6 (Naked Single)
  33. Row 2 / Column 1 → 8 (Hidden Single)
  34. Row 1 / Column 4 → 1 (Hidden Single)
  35. Locked Candidates Type 2 (Claiming): 2 in c1 => r8c3,r9c2<>2
  36. XY-Wing: 3/7/5 in r17c1,r8c3 => r1c3,r8c1<>5
  37. Row 1 / Column 3 → 3 (Naked Single)
  38. Row 1 / Column 1 → 5 (Naked Single)
  39. Row 6 / Column 3 → 2 (Naked Single)
  40. Row 6 / Column 2 → 3 (Full House)
  41. Row 2 / Column 3 → 6 (Naked Single)
  42. Row 3 / Column 2 → 2 (Full House)
  43. Row 7 / Column 2 → 4 (Naked Single)
  44. Row 9 / Column 2 → 6 (Full House)
  45. Row 2 / Column 7 → 4 (Naked Single)
  46. Row 2 / Column 5 → 2 (Full House)
  47. Row 8 / Column 7 → 6 (Full House)
  48. Row 5 / Column 3 → 7 (Naked Single)
  49. Row 5 / Column 1 → 6 (Full House)
  50. Row 8 / Column 3 → 5 (Full House)
  51. Row 3 / Column 4 → 8 (Naked Single)
  52. Row 1 / Column 5 → 4 (Full House)
  53. Row 1 / Column 8 → 8 (Full House)
  54. Row 5 / Column 5 → 8 (Full House)
  55. Row 3 / Column 8 → 6 (Full House)
  56. Row 5 / Column 4 → 2 (Full House)
  57. Row 7 / Column 8 → 7 (Naked Single)
  58. Row 7 / Column 1 → 3 (Full House)
  59. Row 8 / Column 8 → 4 (Full House)
  60. Row 9 / Column 1 → 2 (Naked Single)
  61. Row 8 / Column 1 → 7 (Full House)
  62. Row 8 / Column 6 → 2 (Full House)
  63. Row 9 / Column 6 → 4 (Full House)
Show More...