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

This Sudoku Puzzle has 28 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), undefined, 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 3 / Column 1 → 1 (Hidden Single)
  2. Row 3 / Column 8 → 9 (Hidden Single)
  3. Row 1 / Column 6 → 8 (Hidden Single)
  4. Row 6 / Column 3 → 1 (Hidden Single)
  5. Row 8 / Column 7 → 1 (Hidden Single)
  6. Row 3 / Column 7 → 2 (Hidden Single)
  7. Row 1 / Column 5 → 6 (Hidden Single)
  8. Row 4 / Column 5 → 3 (Naked Single)
  9. Row 8 / Column 9 → 2 (Hidden Single)
  10. Row 4 / Column 8 → 2 (Hidden Single)
  11. Row 4 / Column 2 → 8 (Naked Single)
  12. Row 4 / Column 3 → 6 (Full House)
  13. Row 5 / Column 1 → 3 (Naked Single)
  14. Row 2 / Column 1 → 8 (Naked Single)
  15. Row 8 / Column 1 → 6 (Full House)
  16. Row 7 / Column 9 → 9 (Hidden Single)
  17. Row 6 / Column 8 → 8 (Hidden Single)
  18. Row 9 / Column 3 → 8 (Hidden Single)
  19. Row 8 / Column 4 → 8 (Hidden Single)
  20. Row 8 / Column 6 → 9 (Hidden Single)
  21. Locked Candidates Type 1 (Pointing): 5 in b5 => r7c6<>5
  22. XY-Chain: 3 3- r3c6 -7- r3c5 -4- r8c5 -5- r8c2 -4- r7c3 -3 => r7c6<>3
  23. Row 3 / Column 6 → 3 (Hidden Single)
  24. Discontinuous Nice Loop: 5 r6c9 -5- r6c6 -6- r6c4 -9- r6c2 -4- r5c3 -2- r2c3 -3- r2c9 =3= r6c9 => r6c9<>5
  25. Discontinuous Nice Loop: 6 r6c9 -6- r6c4 -9- r6c2 -4- r5c3 -2- r2c3 -3- r2c9 =3= r6c9 => r6c9<>6
  26. Discontinuous Nice Loop: 6 r7c4 -6- r6c4 -9- r6c2 -4- r5c3 =4= r7c3 =3= r7c4 => r7c4<>6
  27. Discontinuous Nice Loop: 4 r9c4 -4- r8c5 -5- r8c2 =5= r9c2 =3= r9c4 => r9c4<>4
  28. Give Up: Don't know how to proceed!
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