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

This Sudoku Puzzle has 31 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Uniqueness Test 4, Discontinuous Nice Loop, Give Up techniques.

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

Solution Steps:

  1. Row 4 / Column 3 → 1 (Naked Single)
  2. Row 2 / Column 4 → 3 (Naked Single)
  3. Row 5 / Column 5 → 3 (Naked Single)
  4. Row 5 / Column 6 → 9 (Naked Single)
  5. Row 6 / Column 5 → 2 (Full House)
  6. Row 2 / Column 6 → 4 (Naked Single)
  7. Row 8 / Column 6 → 2 (Full House)
  8. Row 4 / Column 2 → 4 (Naked Single)
  9. Row 9 / Column 3 → 3 (Naked Single)
  10. Row 4 / Column 7 → 2 (Naked Single)
  11. Row 4 / Column 8 → 9 (Full House)
  12. Row 6 / Column 2 → 7 (Naked Single)
  13. Row 9 / Column 2 → 1 (Naked Single)
  14. Row 7 / Column 2 → 8 (Naked Single)
  15. Row 1 / Column 2 → 3 (Full House)
  16. Row 7 / Column 1 → 9 (Full House)
  17. Row 9 / Column 4 → 5 (Naked Single)
  18. Row 3 / Column 4 → 1 (Naked Single)
  19. Row 8 / Column 4 → 9 (Full House)
  20. Row 8 / Column 5 → 1 (Naked Single)
  21. Row 9 / Column 5 → 4 (Full House)
  22. Row 9 / Column 8 → 7 (Full House)
  23. Row 2 / Column 7 → 7 (Hidden Single)
  24. Row 3 / Column 3 → 2 (Hidden Single)
  25. Row 7 / Column 9 → 2 (Hidden Single)
  26. Row 1 / Column 1 → 1 (Hidden Single)
  27. Locked Candidates Type 1 (Pointing): 6 in b4 => r5c78<>6
  28. Uniqueness Test 4: 5/8 in r1c57,r3c57 => r13c7<>5
  29. Discontinuous Nice Loop: 3 r6c7 -3- r8c7 -5- r8c9 =5= r3c9 -5- r1c8 -6- r1c7 =6= r6c7 => r6c7<>3
  30. Discontinuous Nice Loop: 4 r6c8 -4- r7c8 -1- r7c7 =1= r5c7 =5= r8c7 =3= r8c9 -3- r6c9 =3= r6c8 => r6c8<>4
  31. Give Up: Don't know how to proceed!
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