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

This Sudoku Puzzle has 18 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Hidden Rectangle, undefined, 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 8 → 6 (Naked Single)
  2. Row 4 / Column 9 → 4 (Naked Single)
  3. Row 6 / Column 9 → 8 (Naked Single)
  4. Row 5 / Column 8 → 7 (Full House)
  5. Row 4 / Column 4 → 2 (Hidden Single)
  6. Row 1 / Column 2 → 2 (Hidden Single)
  7. Row 9 / Column 2 → 8 (Hidden Single)
  8. Row 8 / Column 6 → 2 (Hidden Single)
  9. Row 3 / Column 4 → 8 (Hidden Single)
  10. Row 5 / Column 6 → 8 (Hidden Single)
  11. Row 1 / Column 6 → 5 (Hidden Single)
  12. Locked Candidates Type 1 (Pointing): 7 in b9 => r12c7<>7
  13. Row 2 / Column 4 → 7 (Hidden Single)
  14. Row 9 / Column 5 → 7 (Hidden Single)
  15. Row 8 / Column 7 → 7 (Hidden Single)
  16. Hidden Rectangle: 3/7 in r1c19,r3c19 => r1c1<>3
  17. Finned X-Wing: 9 r34 c15 fr3c2 fr3c3 => r1c1<>9
  18. Give Up: Don't know how to proceed!
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