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

This Sudoku Puzzle has 6 steps and it is solved using Naked Single, Locked Candidates Type 1 (Pointing), Empty Rectangle, Grouped Discontinuous Nice Loop, Give Up techniques.

Naked Single Explanation
Locked Candidates Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 4 / Column 9 → 5 (Naked Single)
  2. Row 8 / Column 7 → 5 (Naked Single)
  3. Locked Candidates Type 1 (Pointing): 3 in b9 => r123c8<>3
  4. Empty Rectangle: 4 in b7 (r4c24) => r9c4<>4
  5. Grouped Discontinuous Nice Loop: 6 r9c1 -6- r23c1 =6= r23c2 -6- r4c2 -4- r56c1 =4= r9c1 => r9c1<>6
  6. Give Up: Don't know how to proceed!
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