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

This Sudoku Puzzle has 69 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, Locked Candidates Type 2 (Claiming), Skyscraper, undefined, 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 9 / Column 5 → 1 (Naked Single)
  2. Row 5 / Column 8 → 4 (Hidden Single)
  3. Row 1 / Column 2 → 6 (Hidden Single)
  4. Row 9 / Column 6 → 4 (Hidden Single)
  5. Row 8 / Column 1 → 1 (Hidden Single)
  6. Row 8 / Column 3 → 4 (Hidden Single)
  7. Row 2 / Column 1 → 4 (Hidden Single)
  8. Row 1 / Column 9 → 4 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 1 in b2 => r1c78<>1
  10. Locked Candidates Type 1 (Pointing): 2 in b4 => r7c3<>2
  11. Locked Candidates Type 1 (Pointing): 9 in b5 => r4c13<>9
  12. Locked Candidates Type 1 (Pointing): 1 in b6 => r4c46<>1
  13. Locked Candidates Type 1 (Pointing): 3 in b9 => r12346c8<>3
  14. Naked Pair: 5,7 in r4c1,r5c2 => r46c3,r6c1<>5, r46c3,r6c1<>7
  15. Row 6 / Column 1 → 9 (Naked Single)
  16. Locked Candidates Type 2 (Claiming): 5 in r6 => r4c789<>5
  17. Locked Candidates Type 2 (Claiming): 5 in c3 => r23c2,r3c1<>5
  18. Skyscraper: 7 in r5c6,r8c5 (connected by r58c2) => r46c5,r7c6<>7
  19. Row 8 / Column 5 → 7 (Hidden Single)
  20. Row 2 / Column 5 → 8 (Hidden Single)
  21. Row 3 / Column 2 → 8 (Hidden Single)
  22. Row 2 / Column 8 → 2 (Hidden Single)
  23. Row 3 / Column 9 → 9 (Hidden Single)
  24. Row 2 / Column 7 → 1 (Hidden Single)
  25. Row 4 / Column 8 → 1 (Hidden Single)
  26. Locked Candidates Type 1 (Pointing): 3 in b2 => r4c4<>3
  27. Locked Candidates Type 2 (Claiming): 7 in r6 => r4c7<>7
  28. Locked Candidates Type 2 (Claiming): 2 in c5 => r4c46<>2
  29. W-Wing: 7/5 in r1c3,r3c8 connected by 5 in r2c39 => r1c78,r3c1<>7
  30. Row 3 / Column 1 → 3 (Naked Single)
  31. Row 2 / Column 2 → 9 (Naked Single)
  32. Row 9 / Column 1 → 5 (Naked Single)
  33. Row 4 / Column 1 → 7 (Full House)
  34. Row 2 / Column 3 → 5 (Naked Single)
  35. Row 1 / Column 3 → 7 (Full House)
  36. Row 2 / Column 9 → 3 (Full House)
  37. Row 8 / Column 2 → 2 (Naked Single)
  38. Row 9 / Column 2 → 3 (Naked Single)
  39. Row 5 / Column 2 → 5 (Naked Single)
  40. Row 7 / Column 2 → 7 (Full House)
  41. Row 7 / Column 3 → 9 (Full House)
  42. Row 9 / Column 8 → 6 (Naked Single)
  43. Row 9 / Column 4 → 9 (Full House)
  44. Row 5 / Column 4 → 1 (Naked Single)
  45. Row 5 / Column 6 → 7 (Full House)
  46. Row 7 / Column 6 → 2 (Naked Single)
  47. Row 4 / Column 4 → 5 (Naked Single)
  48. Row 3 / Column 6 → 5 (Naked Single)
  49. Row 7 / Column 4 → 8 (Naked Single)
  50. Row 7 / Column 8 → 3 (Full House)
  51. Row 8 / Column 4 → 6 (Full House)
  52. Row 1 / Column 4 → 3 (Naked Single)
  53. Row 3 / Column 4 → 2 (Full House)
  54. Row 1 / Column 6 → 1 (Full House)
  55. Row 4 / Column 6 → 9 (Full House)
  56. Row 3 / Column 8 → 7 (Full House)
  57. Row 6 / Column 8 → 5 (Naked Single)
  58. Row 1 / Column 8 → 8 (Full House)
  59. Row 1 / Column 7 → 5 (Full House)
  60. Row 6 / Column 9 → 6 (Naked Single)
  61. Row 8 / Column 7 → 8 (Naked Single)
  62. Row 8 / Column 9 → 5 (Full House)
  63. Row 4 / Column 9 → 8 (Full House)
  64. Row 6 / Column 3 → 2 (Naked Single)
  65. Row 4 / Column 3 → 6 (Full House)
  66. Row 4 / Column 7 → 3 (Naked Single)
  67. Row 4 / Column 5 → 2 (Full House)
  68. Row 6 / Column 5 → 3 (Full House)
  69. Row 6 / Column 7 → 7 (Full House)
Show More...