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

This Sudoku Puzzle has 47 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Skyscraper, Naked Pair, undefined, Empty Rectangle techniques.

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

Solution Steps:

  1. Row 7 / Column 9 → 9 (Naked Single)
  2. Row 6 / Column 3 → 5 (Hidden Single)
  3. Row 8 / Column 3 → 4 (Full House)
  4. Row 1 / Column 5 → 4 (Hidden Single)
  5. Locked Candidates Type 1 (Pointing): 4 in b9 => r6c8<>4
  6. Skyscraper: 5 in r2c5,r5c6 (connected by r25c7) => r3c6,r4c5<>5
  7. Row 5 / Column 6 → 5 (Hidden Single)
  8. Naked Pair: 2,3 in r37c6 => r69c6<>3
  9. Locked Candidates Type 1 (Pointing): 3 in b5 => r8c5<>3
  10. Skyscraper: 3 in r7c6,r8c7 (connected by r3c67) => r7c8,r8c4<>3
  11. Row 7 / Column 8 → 4 (Naked Single)
  12. Row 9 / Column 4 → 4 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 3 in b8 => r7c2<>3
  14. Row 7 / Column 2 → 5 (Naked Single)
  15. X-Wing: 1 c49 r18 => r1c8,r8c57<>1
  16. Empty Rectangle: 1 in b5 (r2c57) => r6c7<>1
  17. W-Wing: 3/1 in r1c4,r9c8 connected by 1 in r8c49 => r1c8<>3
  18. Row 1 / Column 8 → 7 (Naked Single)
  19. Row 1 / Column 9 → 1 (Naked Single)
  20. Row 1 / Column 4 → 3 (Full House)
  21. Row 8 / Column 9 → 7 (Full House)
  22. Row 2 / Column 7 → 5 (Naked Single)
  23. Row 2 / Column 5 → 1 (Full House)
  24. Row 3 / Column 6 → 2 (Naked Single)
  25. Row 3 / Column 4 → 5 (Full House)
  26. Row 7 / Column 4 → 2 (Naked Single)
  27. Row 7 / Column 6 → 3 (Full House)
  28. Row 8 / Column 4 → 1 (Full House)
  29. Row 8 / Column 7 → 3 (Naked Single)
  30. Row 9 / Column 8 → 1 (Full House)
  31. Row 9 / Column 6 → 9 (Naked Single)
  32. Row 6 / Column 6 → 1 (Full House)
  33. Row 8 / Column 5 → 5 (Full House)
  34. Row 8 / Column 2 → 9 (Full House)
  35. Row 9 / Column 2 → 3 (Full House)
  36. Row 3 / Column 7 → 9 (Naked Single)
  37. Row 3 / Column 8 → 3 (Full House)
  38. Row 6 / Column 8 → 9 (Naked Single)
  39. Row 4 / Column 8 → 5 (Full House)
  40. Row 4 / Column 7 → 1 (Naked Single)
  41. Row 5 / Column 7 → 4 (Naked Single)
  42. Row 5 / Column 1 → 9 (Full House)
  43. Row 6 / Column 7 → 7 (Full House)
  44. Row 6 / Column 5 → 3 (Naked Single)
  45. Row 4 / Column 5 → 9 (Full House)
  46. Row 4 / Column 1 → 3 (Full House)
  47. Row 6 / Column 1 → 4 (Full House)
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