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

This Sudoku Puzzle has 69 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Uniqueness Test 3, Finned Swordfish, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 9 / Column 3 → 5 (Naked Single)
  2. Row 5 / Column 3 → 2 (Hidden Single)
  3. Row 8 / Column 8 → 2 (Hidden Single)
  4. Row 2 / Column 3 → 8 (Hidden Single)
  5. Row 1 / Column 7 → 8 (Hidden Single)
  6. Row 3 / Column 1 → 5 (Hidden Single)
  7. Row 4 / Column 2 → 7 (Hidden Single)
  8. Row 8 / Column 2 → 6 (Hidden Single)
  9. Row 7 / Column 3 → 3 (Naked Single)
  10. Row 3 / Column 3 → 6 (Naked Single)
  11. Row 1 / Column 3 → 7 (Full House)
  12. Row 2 / Column 9 → 5 (Hidden Single)
  13. Row 2 / Column 8 → 7 (Hidden Single)
  14. Row 5 / Column 4 → 7 (Hidden Single)
  15. Row 2 / Column 2 → 9 (Hidden Single)
  16. Locked Candidates Type 1 (Pointing): 1 in b3 => r3c5<>1
  17. Locked Candidates Type 1 (Pointing): 6 in b3 => r1c5<>6
  18. Locked Candidates Type 1 (Pointing): 2 in b6 => r3c7<>2
  19. Locked Candidates Type 2 (Claiming): 3 in r2 => r1c56,r3c5<>3
  20. Locked Candidates Type 2 (Claiming): 1 in r8 => r7c56,r9c5<>1
  21. Locked Candidates Type 2 (Claiming): 9 in r8 => r7c56,r9c5<>9
  22. Locked Candidates Type 2 (Claiming): 4 in c4 => r4c56,r5c56,r6c56<>4
  23. 2-String Kite: 3 in r1c8,r6c2 (connected by r1c1,r3c2) => r6c8<>3
  24. Uniqueness Test 3: 1/9 in r7c19,r9c19 => r7c7<>6
  25. Locked Candidates Type 2 (Claiming): 6 in c7 => r46c8,r5c9<>6
  26. Finned Swordfish: 4 r159 c159 fr1c6 => r3c5<>4
  27. Row 3 / Column 5 → 2 (Naked Single)
  28. Row 3 / Column 9 → 1 (Naked Single)
  29. Row 3 / Column 7 → 3 (Naked Single)
  30. Row 3 / Column 2 → 4 (Full House)
  31. Row 1 / Column 1 → 3 (Full House)
  32. Row 6 / Column 2 → 3 (Full House)
  33. Row 1 / Column 8 → 6 (Naked Single)
  34. Row 1 / Column 9 → 2 (Full House)
  35. Row 7 / Column 8 → 4 (Naked Single)
  36. Row 6 / Column 8 → 5 (Naked Single)
  37. Row 4 / Column 8 → 3 (Full House)
  38. Row 7 / Column 6 → 5 (Naked Single)
  39. Row 9 / Column 9 → 9 (Naked Single)
  40. Row 7 / Column 5 → 7 (Naked Single)
  41. Row 5 / Column 9 → 4 (Naked Single)
  42. Row 7 / Column 9 → 6 (Full House)
  43. Row 9 / Column 1 → 1 (Naked Single)
  44. Row 7 / Column 1 → 9 (Full House)
  45. Row 7 / Column 7 → 1 (Full House)
  46. Row 9 / Column 7 → 7 (Full House)
  47. Row 9 / Column 5 → 4 (Full House)
  48. Row 1 / Column 5 → 9 (Naked Single)
  49. Row 1 / Column 6 → 4 (Full House)
  50. Row 6 / Column 5 → 6 (Naked Single)
  51. Row 5 / Column 5 → 3 (Naked Single)
  52. Row 2 / Column 5 → 1 (Naked Single)
  53. Row 4 / Column 5 → 5 (Full House)
  54. Row 2 / Column 4 → 6 (Naked Single)
  55. Row 2 / Column 6 → 3 (Full House)
  56. Bivalue Universal Grave + 1 => r6c6<>2, r6c6<>8
  57. Row 6 / Column 6 → 9 (Naked Single)
  58. Row 5 / Column 6 → 8 (Naked Single)
  59. Row 6 / Column 4 → 4 (Naked Single)
  60. Row 6 / Column 7 → 2 (Naked Single)
  61. Row 6 / Column 1 → 8 (Full House)
  62. Row 8 / Column 6 → 1 (Naked Single)
  63. Row 4 / Column 6 → 2 (Full House)
  64. Row 4 / Column 4 → 1 (Full House)
  65. Row 8 / Column 4 → 9 (Full House)
  66. Row 5 / Column 1 → 6 (Naked Single)
  67. Row 4 / Column 1 → 4 (Full House)
  68. Row 4 / Column 7 → 6 (Full House)
  69. Row 5 / Column 7 → 9 (Full House)
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