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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Naked Triple, Empty Rectangle, Uniqueness Test 1, Full House 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 5 / Column 1 → 7 (Hidden Single)
  2. Row 4 / Column 8 → 3 (Hidden Single)
  3. Row 5 / Column 4 → 3 (Hidden Single)
  4. Locked Triple: 1,5,6 in r456c7 => r13c7,r5c9<>1, r139c7,r5c9,r6c8<>5, r1379c7,r5c9,r6c8<>6
  5. Row 9 / Column 7 → 3 (Naked Single)
  6. Row 7 / Column 7 → 7 (Naked Single)
  7. Row 7 / Column 1 → 3 (Hidden Single)
  8. Row 1 / Column 8 → 7 (Hidden Single)
  9. Row 8 / Column 2 → 7 (Hidden Single)
  10. Row 9 / Column 1 → 4 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 5 in b7 => r5c3<>5
  12. Locked Candidates Type 2 (Claiming): 9 in r2 => r1c4<>9
  13. X-Wing: 2 r68 c48 => r47c4<>2
  14. Row 4 / Column 1 → 2 (Hidden Single)
  15. Row 5 / Column 3 → 6 (Naked Single)
  16. Row 1 / Column 3 → 2 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 8 in b4 => r27c2<>8
  18. Locked Candidates Type 1 (Pointing): 8 in b7 => r3c3<>8
  19. Locked Candidates Type 2 (Claiming): 8 in r2 => r1c45,r3c5<>8
  20. Naked Triple: 1,5,6 in r1c459 => r1c1<>6
  21. Empty Rectangle: 6 in b9 (r38c1) => r3c9<>6
  22. Uniqueness Test 1: 8/9 in r1c17,r3c17 => r3c1<>8, r3c1<>9
  23. Row 3 / Column 1 → 6 (Naked Single)
  24. Row 2 / Column 2 → 1 (Naked Single)
  25. Row 8 / Column 1 → 9 (Naked Single)
  26. Row 1 / Column 1 → 8 (Full House)
  27. Row 3 / Column 3 → 9 (Full House)
  28. Row 7 / Column 2 → 6 (Naked Single)
  29. Row 1 / Column 7 → 9 (Naked Single)
  30. Row 3 / Column 7 → 8 (Naked Single)
  31. Row 7 / Column 9 → 2 (Naked Single)
  32. Row 5 / Column 9 → 4 (Naked Single)
  33. Row 5 / Column 6 → 1 (Naked Single)
  34. Row 6 / Column 8 → 2 (Naked Single)
  35. Row 5 / Column 7 → 5 (Naked Single)
  36. Row 5 / Column 5 → 2 (Full House)
  37. Row 8 / Column 6 → 6 (Naked Single)
  38. Row 6 / Column 7 → 6 (Naked Single)
  39. Row 4 / Column 7 → 1 (Full House)
  40. Row 4 / Column 6 → 8 (Naked Single)
  41. Row 8 / Column 8 → 5 (Naked Single)
  42. Row 9 / Column 9 → 6 (Full House)
  43. Row 9 / Column 5 → 8 (Naked Single)
  44. Row 4 / Column 2 → 5 (Naked Single)
  45. Row 4 / Column 4 → 6 (Full House)
  46. Row 6 / Column 2 → 8 (Full House)
  47. Row 6 / Column 6 → 4 (Naked Single)
  48. Row 2 / Column 6 → 9 (Full House)
  49. Row 6 / Column 4 → 5 (Full House)
  50. Row 3 / Column 8 → 4 (Naked Single)
  51. Row 2 / Column 8 → 6 (Full House)
  52. Row 8 / Column 3 → 1 (Naked Single)
  53. Row 8 / Column 4 → 2 (Full House)
  54. Row 9 / Column 3 → 5 (Naked Single)
  55. Row 9 / Column 4 → 9 (Full House)
  56. Row 7 / Column 3 → 8 (Full House)
  57. Row 1 / Column 4 → 1 (Naked Single)
  58. Row 2 / Column 5 → 4 (Naked Single)
  59. Row 2 / Column 4 → 8 (Full House)
  60. Row 7 / Column 4 → 4 (Full House)
  61. Row 7 / Column 5 → 1 (Full House)
  62. Row 1 / Column 9 → 5 (Naked Single)
  63. Row 1 / Column 5 → 6 (Full House)
  64. Row 3 / Column 5 → 5 (Full House)
  65. Row 3 / Column 9 → 1 (Full House)
Show More...