Samurai Sudoku
Five overlapping 9×9 grids sharing corner boxes
Samurai Sudoku is fully playable. Choose a difficulty and start solving.
Five 9×9 puzzles lock together in an X shape, trading information through four shared corner boxes. Each grid is solvable Sudoku on its own, but breakthroughs flow across the overlaps. A marathon by scale rather than by trickery — set aside a proper session.
For the complete rules, worked examples and solving techniques, read the full How to Play Samurai Sudoku guide.
Like all Sudoku variants, Samurai Sudoku builds on the classic 9×9 foundation. Every row, column, and 3×3 box must contain each digit from 1 to 9 exactly once. The variant constraint is added on top of these standard rules, never replacing them.
If you're new to Sudoku, start by learning the basic rules and techniques before attempting variants.
Techniques Useful for This Variant
| Technique | How it applies |
|---|---|
| Pencil Marks / Notes | Essential for tracking candidates alongside the variant constraint |
| Obvious Singles | Cells narrowed to one candidate by the combined constraints |
| Hidden Singles | Digits with only one valid cell in a unit after variant elimination |
| Pairs and Triples | Locked candidates exposed by the additional constraint |