2
3
3
1
9
5
3
5
5
3
2
3
3
2

This Sudoku Puzzle has 9 steps and it is solved using Naked Quadruple, Naked Single, Locked Candidates Type 1 (Pointing), Hidden Single, Hidden Pair, Give Up techniques.

Naked Single Explanation
Hidden Single Explanation
Hidden Pair Explanation
Locked Candidates Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Naked Quadruple: 4,6,7,8 in r5c12,r6c12 => r56c3<>4, r56c3<>6, r56c3<>7, r56c3<>8
  2. Row 5 / Column 3 → 2 (Naked Single)
  3. Row 6 / Column 3 → 2 (Naked Single)
  4. Locked Candidates Type 1 (Pointing): 2 in b5 => r4c79<>2
  5. Row 3 / Column 7 → 2 (Hidden Single)
  6. Hidden Pair: 2,3 in r37c3 => r37c3<>1, r37c3<>4, r37c3<>6, r37c3<>7, r37c3<>8, r37c3<>9
  7. Row 3 / Column 3 → 3 (Naked Single)
  8. Row 7 / Column 3 → 3 (Naked Single)
  9. Give Up: Don't know how to proceed!
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