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

This Sudoku Puzzle has 70 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Hidden Pair, undefined, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 1 → 9 (Hidden Single)
  2. Row 2 / Column 9 → 4 (Naked Single)
  3. Row 9 / Column 3 → 9 (Hidden Single)
  4. Row 8 / Column 8 → 9 (Hidden Single)
  5. Row 1 / Column 8 → 5 (Naked Single)
  6. Row 1 / Column 9 → 9 (Naked Single)
  7. Row 3 / Column 9 → 1 (Naked Single)
  8. Row 7 / Column 5 → 1 (Hidden Single)
  9. Row 8 / Column 2 → 1 (Hidden Single)
  10. Row 2 / Column 5 → 3 (Hidden Single)
  11. Row 5 / Column 8 → 1 (Hidden Single)
  12. Row 6 / Column 6 → 1 (Hidden Single)
  13. Row 8 / Column 4 → 3 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 6 in b1 => r45c2<>6
  15. Locked Candidates Type 2 (Claiming): 4 in r8 => r9c56<>4
  16. Locked Candidates Type 2 (Claiming): 5 in r8 => r79c4,r9c56<>5
  17. Locked Candidates Type 2 (Claiming): 5 in c4 => r4c56,r5c5<>5
  18. Naked Pair: 6,7 in r24c6 => r39c6<>7, r9c6<>6
  19. Row 9 / Column 6 → 8 (Naked Single)
  20. Row 7 / Column 9 → 8 (Hidden Single)
  21. Naked Pair: 4,5 in r67c7 => r45c7<>5, r5c7<>4
  22. Locked Candidates Type 1 (Pointing): 4 in b6 => r6c13<>4
  23. Hidden Pair: 7,8 in r6c14 => r6c1<>3, r6c14<>5, r6c4<>6
  24. Row 5 / Column 4 → 5 (Hidden Single)
  25. Locked Candidates Type 1 (Pointing): 5 in b4 => r4c9<>5
  26. Hidden Pair: 5,7 in r49c2 => r49c2<>2, r9c2<>4
  27. X-Wing: 7 r67 c14 => r49c1,r9c4<>7
  28. W-Wing: 6/7 in r4c6,r9c5 connected by 7 in r49c2 => r45c5<>6
  29. Row 5 / Column 3 → 6 (Hidden Single)
  30. Row 6 / Column 3 → 3 (Naked Single)
  31. Row 4 / Column 6 → 6 (Hidden Single)
  32. Row 2 / Column 6 → 7 (Naked Single)
  33. Row 4 / Column 9 → 3 (Naked Single)
  34. Row 2 / Column 8 → 2 (Naked Single)
  35. Row 2 / Column 2 → 6 (Full House)
  36. Row 3 / Column 8 → 7 (Full House)
  37. Row 3 / Column 1 → 3 (Hidden Single)
  38. Row 9 / Column 8 → 3 (Hidden Single)
  39. Row 9 / Column 1 → 4 (Hidden Single)
  40. Row 7 / Column 3 → 2 (Naked Single)
  41. Row 3 / Column 3 → 4 (Full House)
  42. Row 1 / Column 2 → 8 (Naked Single)
  43. Row 3 / Column 2 → 2 (Full House)
  44. Row 3 / Column 6 → 5 (Naked Single)
  45. Row 3 / Column 5 → 8 (Full House)
  46. Row 8 / Column 6 → 4 (Full House)
  47. Row 8 / Column 5 → 5 (Full House)
  48. Row 1 / Column 4 → 6 (Naked Single)
  49. Row 1 / Column 5 → 4 (Full House)
  50. Row 5 / Column 2 → 4 (Naked Single)
  51. Row 5 / Column 5 → 9 (Naked Single)
  52. Row 7 / Column 4 → 7 (Naked Single)
  53. Row 9 / Column 4 → 2 (Naked Single)
  54. Row 6 / Column 4 → 8 (Full House)
  55. Row 4 / Column 5 → 7 (Full House)
  56. Row 9 / Column 5 → 6 (Full House)
  57. Row 5 / Column 7 → 2 (Naked Single)
  58. Row 5 / Column 1 → 8 (Full House)
  59. Row 7 / Column 1 → 5 (Naked Single)
  60. Row 9 / Column 2 → 7 (Full House)
  61. Row 4 / Column 2 → 5 (Full House)
  62. Row 9 / Column 9 → 5 (Full House)
  63. Row 6 / Column 9 → 6 (Full House)
  64. Row 6 / Column 1 → 7 (Naked Single)
  65. Row 4 / Column 1 → 2 (Full House)
  66. Row 4 / Column 7 → 9 (Full House)
  67. Row 7 / Column 7 → 4 (Naked Single)
  68. Row 6 / Column 7 → 5 (Full House)
  69. Row 6 / Column 8 → 4 (Full House)
  70. Row 7 / Column 8 → 6 (Full House)
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