Medium Clone Sudoku
Ready to sharpen your skills? Medium Clone Sudoku puzzles introduce interactions between the variant constraint and classic Sudoku techniques. You'll need to combine both skill sets to progress.
What to expect at Medium level
Medium Clone Sudoku puzzles require you to combine the variant constraint with standard Sudoku deduction - Naked pairs, hidden singles, and unit scans. The constraint is more tightly woven into the grid, so you'll need to think a few steps ahead.
Best suited for players comfortable with Easy Clone Sudoku who want to build their pattern recognition.
Difficulty overview
About Clone Sudoku
Clone Sudoku marks pairs of regions (clones) on the grid. Each pair of clone regions must contain exactly the same arrangement of digits — if one clone has a 3 in its top-left cell, the other clone must also have a 3 in its corresponding cell. Clone constraints create powerful symmetry-based deductions that can resolve entire regions at once.
Solving Techniques for Medium Level
| Technique | Description | Level |
|---|---|---|
| Clone Pair Deduction | Any digit placed in one clone region immediately forces the same digit in the corresponding cell of the other clone region. | Beginner |
| Constraint Propagation | A clone placement propagates through standard row, column, and box constraints in both regions simultaneously. | Intermediate |
| Clone-Box Interaction | If both clone regions share boxes with heavily constrained cells, the clone constraint rapidly resolves entire boxes. | Intermediate |
Master these, then take on Hard Killer Sudoku to learn Advanced techniques.