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

This Sudoku Puzzle has 39 steps and it is solved using Locked Candidates Type 1 (Pointing), Naked Pair, Hidden Pair, Skyscraper, Naked Single, Full House techniques.

Naked Single Explanation
Hidden Pair Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 7 in b7 => r56c1<>7
  2. Naked Pair: 5,6 in r8c36 => r8c1<>5
  3. Naked Pair: 1,8 in r27c4 => r69c4<>1, r9c4<>8
  4. Hidden Pair: 3,4 in r56c1 => r5c1<>2, r6c1<>1, r6c1<>5
  5. Locked Candidates Type 1 (Pointing): 1 in b4 => r4c5<>1
  6. Naked Pair: 3,4 in r5c16 => r5c4<>4
  7. Skyscraper: 5 in r4c3,r6c6 (connected by r8c36) => r4c5,r6c2<>5
  8. Row 4 / Column 5 → 2 (Naked Single)
  9. Row 6 / Column 2 → 7 (Naked Single)
  10. Row 5 / Column 4 → 7 (Naked Single)
  11. Row 5 / Column 2 → 2 (Naked Single)
  12. Row 2 / Column 2 → 5 (Full House)
  13. Row 2 / Column 1 → 2 (Full House)
  14. Row 6 / Column 4 → 4 (Naked Single)
  15. Row 5 / Column 6 → 3 (Naked Single)
  16. Row 5 / Column 1 → 4 (Full House)
  17. Row 6 / Column 1 → 3 (Naked Single)
  18. Row 9 / Column 4 → 2 (Naked Single)
  19. Row 2 / Column 6 → 1 (Naked Single)
  20. Row 2 / Column 4 → 8 (Naked Single)
  21. Row 2 / Column 5 → 3 (Full House)
  22. Row 7 / Column 4 → 1 (Full House)
  23. Row 6 / Column 6 → 5 (Naked Single)
  24. Row 6 / Column 5 → 1 (Full House)
  25. Row 9 / Column 5 → 8 (Naked Single)
  26. Row 7 / Column 5 → 5 (Full House)
  27. Row 7 / Column 1 → 8 (Full House)
  28. Row 8 / Column 6 → 6 (Naked Single)
  29. Row 9 / Column 6 → 4 (Full House)
  30. Row 9 / Column 7 → 7 (Naked Single)
  31. Row 3 / Column 7 → 8 (Full House)
  32. Row 8 / Column 9 → 8 (Full House)
  33. Row 3 / Column 9 → 7 (Full House)
  34. Row 8 / Column 1 → 7 (Naked Single)
  35. Row 8 / Column 3 → 5 (Full House)
  36. Row 9 / Column 1 → 1 (Naked Single)
  37. Row 4 / Column 1 → 5 (Full House)
  38. Row 4 / Column 3 → 1 (Full House)
  39. Row 9 / Column 3 → 6 (Full House)
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