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

This Sudoku Puzzle has 70 steps and it is solved using Naked Single, Hidden Single, Locked Triple, Locked Candidates Type 1 (Pointing), Naked Triple, Hidden Pair, Naked Pair, undefined, Full House, Uniqueness Test 1 techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 2 → 7 (Naked Single)
  2. Row 4 / Column 8 → 3 (Hidden Single)
  3. Row 9 / Column 9 → 3 (Hidden Single)
  4. Row 8 / Column 2 → 3 (Hidden Single)
  5. Row 6 / Column 9 → 7 (Hidden Single)
  6. Row 7 / Column 2 → 8 (Hidden Single)
  7. Row 5 / Column 9 → 9 (Hidden Single)
  8. Row 9 / Column 7 → 8 (Hidden Single)
  9. Row 9 / Column 3 → 6 (Hidden Single)
  10. Row 7 / Column 3 → 9 (Hidden Single)
  11. Row 9 / Column 5 → 9 (Hidden Single)
  12. Locked Triple: 1,2,5 in r123c3 => r13c1,r5c3<>2, r13c1,r58c3<>5, r13c1<>1
  13. Locked Candidates Type 1 (Pointing): 4 in b4 => r5c45<>4
  14. Row 5 / Column 5 → 2 (Naked Single)
  15. Row 4 / Column 1 → 2 (Hidden Single)
  16. Locked Candidates Type 1 (Pointing): 6 in b6 => r17c7<>6
  17. Locked Candidates Type 1 (Pointing): 5 in b7 => r5c1<>5
  18. Naked Triple: 1,4,5 in r7c5,r9c46 => r7c6<>1, r78c6,r8c4<>4, r78c6,r8c4<>5
  19. Locked Candidates Type 1 (Pointing): 5 in b8 => r9c1<>5
  20. Hidden Pair: 7,8 in r18c4 => r1c4<>1, r18c4<>2, r1c4<>6
  21. Row 2 / Column 4 → 2 (Hidden Single)
  22. Row 2 / Column 3 → 1 (Naked Single)
  23. Locked Candidates Type 1 (Pointing): 6 in b2 => r4c6<>6
  24. Naked Pair: 2,5 in r3c39 => r3c78<>5, r3c8<>2
  25. Locked Candidates Type 1 (Pointing): 2 in b3 => r7c9<>2
  26. X-Wing: 4 c57 r37 => r3c68,r7c18<>4
  27. Row 3 / Column 8 → 1 (Naked Single)
  28. Row 6 / Column 8 → 5 (Naked Single)
  29. Row 5 / Column 7 → 6 (Naked Single)
  30. Row 4 / Column 7 → 1 (Full House)
  31. Row 6 / Column 2 → 9 (Naked Single)
  32. Row 4 / Column 2 → 5 (Full House)
  33. Row 5 / Column 4 → 5 (Naked Single)
  34. Row 4 / Column 4 → 6 (Naked Single)
  35. Row 4 / Column 6 → 9 (Full House)
  36. Row 8 / Column 1 → 5 (Hidden Single)
  37. Row 9 / Column 6 → 5 (Hidden Single)
  38. Naked Pair: 7,8 in r1c4,r3c6 => r1c6<>7, r1c6<>8
  39. Uniqueness Test 1: 2/5 in r1c39,r3c39 => r1c9<>2, r1c9<>5
  40. Row 1 / Column 9 → 6 (Naked Single)
  41. Row 1 / Column 6 → 1 (Naked Single)
  42. Row 2 / Column 8 → 4 (Naked Single)
  43. Row 2 / Column 6 → 6 (Full House)
  44. Row 7 / Column 9 → 5 (Naked Single)
  45. Row 3 / Column 9 → 2 (Full House)
  46. Row 1 / Column 5 → 3 (Naked Single)
  47. Row 6 / Column 6 → 4 (Naked Single)
  48. Row 6 / Column 4 → 1 (Full House)
  49. Row 3 / Column 7 → 7 (Naked Single)
  50. Row 1 / Column 7 → 5 (Full House)
  51. Row 7 / Column 7 → 4 (Full House)
  52. Row 8 / Column 8 → 2 (Naked Single)
  53. Row 7 / Column 8 → 6 (Full House)
  54. Row 3 / Column 3 → 5 (Naked Single)
  55. Row 1 / Column 1 → 8 (Naked Single)
  56. Row 3 / Column 5 → 4 (Naked Single)
  57. Row 7 / Column 5 → 1 (Full House)
  58. Row 9 / Column 4 → 4 (Naked Single)
  59. Row 9 / Column 1 → 1 (Full House)
  60. Row 3 / Column 6 → 8 (Naked Single)
  61. Row 1 / Column 4 → 7 (Full House)
  62. Row 1 / Column 3 → 2 (Full House)
  63. Row 3 / Column 1 → 3 (Full House)
  64. Row 8 / Column 4 → 8 (Full House)
  65. Row 7 / Column 1 → 7 (Naked Single)
  66. Row 5 / Column 1 → 4 (Full House)
  67. Row 7 / Column 6 → 2 (Full House)
  68. Row 8 / Column 6 → 7 (Full House)
  69. Row 8 / Column 3 → 4 (Full House)
  70. Row 5 / Column 3 → 7 (Full House)
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