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

This Sudoku Puzzle has 39 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), undefined, Uniqueness Test 1, Give Up techniques.

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

Solution Steps:

  1. Row 5 / Column 2 → 1 (Naked Single)
  2. Row 7 / Column 2 → 4 (Naked Single)
  3. Row 2 / Column 2 → 9 (Naked Single)
  4. Row 9 / Column 2 → 6 (Naked Single)
  5. Row 1 / Column 1 → 1 (Naked Single)
  6. Row 2 / Column 3 → 4 (Full House)
  7. Row 1 / Column 4 → 8 (Hidden Single)
  8. Row 1 / Column 5 → 6 (Hidden Single)
  9. Row 3 / Column 8 → 6 (Hidden Single)
  10. Row 7 / Column 9 → 7 (Hidden Single)
  11. Row 9 / Column 3 → 1 (Hidden Single)
  12. Row 9 / Column 5 → 4 (Hidden Single)
  13. Row 1 / Column 7 → 9 (Hidden Single)
  14. Row 4 / Column 1 → 9 (Hidden Single)
  15. Row 8 / Column 9 → 4 (Hidden Single)
  16. Row 1 / Column 9 → 3 (Naked Single)
  17. Row 1 / Column 8 → 4 (Full House)
  18. Row 5 / Column 9 → 2 (Naked Single)
  19. Row 5 / Column 1 → 8 (Naked Single)
  20. Row 8 / Column 1 → 2 (Full House)
  21. Row 8 / Column 3 → 8 (Full House)
  22. Row 5 / Column 3 → 3 (Naked Single)
  23. Row 5 / Column 4 → 4 (Full House)
  24. Row 6 / Column 3 → 6 (Naked Single)
  25. Row 4 / Column 3 → 2 (Full House)
  26. Row 6 / Column 9 → 1 (Naked Single)
  27. Row 4 / Column 9 → 6 (Full House)
  28. Row 4 / Column 7 → 4 (Hidden Single)
  29. Locked Candidates Type 1 (Pointing): 2 in b3 => r7c7<>2
  30. W-Wing: 3/1 in r2c5,r4c6 connected by 1 in r7c56 => r2c6<>3
  31. XY-Wing: 1/2/3 in r2c5,r39c4 => r2c4,r7c5<>3
  32. Row 7 / Column 5 → 1 (Naked Single)
  33. Row 2 / Column 5 → 3 (Full House)
  34. Uniqueness Test 1: 1/2 in r2c47,r3c47 => r2c4<>1, r2c4<>2
  35. Row 2 / Column 4 → 5 (Naked Single)
  36. Row 8 / Column 4 → 9 (Naked Single)
  37. Row 8 / Column 6 → 5 (Full House)
  38. Row 6 / Column 6 → 9 (Hidden Single)
  39. Give Up: Don't know how to proceed!
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