Cube / 3D Sudoku
Sudoku arranged on the faces of a cube or other 3D layout
Cube / 3D Sudoku is fully playable. Choose a difficulty and start solving.
Two full 9×9 grids share a single 3×3 corner box, and that overlap must satisfy both at once. Progress alternates between the grids, with the shared box acting as the message channel. Double the canvas, plus a coordination layer single-grid play lacks.
For the complete rules, worked examples and solving techniques, read the full How to Play Cube / 3D Sudoku guide.
Like all Sudoku variants, Cube / 3D 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 |