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

This Sudoku Puzzle has 67 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Skyscraper, undefined, Locked Candidates Type 2 (Claiming), Uniqueness Test 1 techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 4 / Column 8 → 6 (Naked Single)
  2. Row 4 / Column 9 → 4 (Naked Single)
  3. Row 6 / Column 9 → 8 (Naked Single)
  4. Row 5 / Column 8 → 7 (Full House)
  5. Row 4 / Column 4 → 2 (Hidden Single)
  6. Row 1 / Column 2 → 2 (Hidden Single)
  7. Row 9 / Column 2 → 8 (Hidden Single)
  8. Row 9 / Column 9 → 2 (Hidden Single)
  9. Row 3 / Column 4 → 8 (Hidden Single)
  10. Row 8 / Column 6 → 2 (Hidden Single)
  11. Row 5 / Column 6 → 8 (Hidden Single)
  12. Row 1 / Column 6 → 5 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 6 in b4 => r2c2<>6
  14. Locked Candidates Type 1 (Pointing): 7 in b9 => r12c7<>7
  15. Row 2 / Column 4 → 7 (Hidden Single)
  16. Row 9 / Column 5 → 7 (Hidden Single)
  17. Row 8 / Column 7 → 7 (Hidden Single)
  18. Row 8 / Column 2 → 4 (Hidden Single)
  19. Row 2 / Column 6 → 4 (Hidden Single)
  20. Row 1 / Column 1 → 4 (Hidden Single)
  21. Row 7 / Column 5 → 4 (Hidden Single)
  22. Row 9 / Column 7 → 4 (Hidden Single)
  23. Row 1 / Column 9 → 7 (Hidden Single)
  24. Row 3 / Column 9 → 3 (Naked Single)
  25. Row 7 / Column 9 → 6 (Full House)
  26. Row 3 / Column 1 → 7 (Hidden Single)
  27. Row 9 / Column 4 → 6 (Hidden Single)
  28. Row 5 / Column 4 → 1 (Naked Single)
  29. Row 2 / Column 3 → 3 (Hidden Single)
  30. Row 2 / Column 7 → 6 (Hidden Single)
  31. Row 1 / Column 3 → 6 (Hidden Single)
  32. Skyscraper: 9 in r7c7,r8c4 (connected by r1c47) => r7c6,r8c8<>9
  33. 2-String Kite: 9 in r4c1,r9c6 (connected by r4c5,r6c6) => r9c1<>9
  34. XY-Wing: 3/9/1 in r6c16,r7c6 => r7c1<>1
  35. Row 7 / Column 6 → 1 (Hidden Single)
  36. W-Wing: 3/9 in r7c1,r9c6 connected by 9 in r8c34 => r9c1<>3
  37. Row 7 / Column 1 → 3 (Hidden Single)
  38. Locked Candidates Type 1 (Pointing): 9 in b7 => r3c3<>9
  39. Locked Candidates Type 1 (Pointing): 9 in b1 => r6c2<>9
  40. Locked Candidates Type 2 (Claiming): 9 in r7 => r9c8<>9
  41. Uniqueness Test 1: 8/9 in r1c78,r7c78 => r1c8<>8, r1c8<>9
  42. Row 1 / Column 8 → 1 (Naked Single)
  43. Row 2 / Column 8 → 9 (Naked Single)
  44. Row 1 / Column 7 → 8 (Full House)
  45. Row 2 / Column 2 → 1 (Full House)
  46. Row 7 / Column 7 → 9 (Full House)
  47. Row 7 / Column 8 → 8 (Full House)
  48. Row 3 / Column 3 → 5 (Naked Single)
  49. Row 3 / Column 2 → 9 (Full House)
  50. Row 3 / Column 5 → 1 (Full House)
  51. Row 6 / Column 2 → 6 (Naked Single)
  52. Row 5 / Column 2 → 5 (Full House)
  53. Row 5 / Column 5 → 6 (Full House)
  54. Row 8 / Column 3 → 9 (Naked Single)
  55. Row 9 / Column 3 → 1 (Full House)
  56. Row 9 / Column 1 → 5 (Full House)
  57. Row 4 / Column 1 → 9 (Naked Single)
  58. Row 4 / Column 5 → 5 (Full House)
  59. Row 6 / Column 1 → 1 (Full House)
  60. Row 8 / Column 4 → 3 (Naked Single)
  61. Row 1 / Column 4 → 9 (Full House)
  62. Row 8 / Column 8 → 5 (Full House)
  63. Row 9 / Column 8 → 3 (Full House)
  64. Row 9 / Column 6 → 9 (Full House)
  65. Row 1 / Column 5 → 3 (Full House)
  66. Row 6 / Column 6 → 3 (Full House)
  67. Row 6 / Column 5 → 9 (Full House)
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