Cube / 3D Sudoku
Sudoku arranged on the faces of a cube or other 3D layout
Easy
Cube / 3D Sudoku Easy
Medium
Cube / 3D Sudoku Medium
Hard
Cube / 3D Sudoku Hard
Expert
Cube / 3D Sudoku Expert
What is Cube / 3D Sudoku?
3D Sudoku variants arrange Sudoku grids in three-dimensional configurations — typically on the six faces of a cube, where adjacent faces share an edge row or column. Solutions must satisfy Sudoku rules on every face independently while also satisfying constraints along shared edges. This creates a spectacular visual puzzle format with unique cross-face logic.
At a Glance
| Constraint type | Twin Grids |
| Typical givens | ~30 per grid |
| Difficulty rating | ★★★★☆ 4/5 |
| Avg. solve time — Easy | 15 min |
| Avg. solve time — Medium | 32 min |
| Avg. solve time — Hard | 60 min |
| Avg. solve time — Expert | 95 min |
How to Solve Cube / 3D Sudoku
| Technique | What it does | Level |
|---|---|---|
| Shared Box Exploitation | The overlapping 3×3 box satisfies both grids. Digits placed here eliminate from rows and columns in both Grid A and Grid B simultaneously. | Beginner |
| Grid A/B Isolation | Outside the shared box, each grid operates independently. Apply standard 9×9 Sudoku logic to each grid in turn. | Intermediate |
| Cross-Grid Cascade | Completing the shared box often cascades through the adjacent rows and columns of both grids, rapidly resolving nearby cells. | Intermediate |
| Overlap Constraint | The shared box must satisfy: Grid A's bottom-right box rules, AND Grid B's top-left box rules, AND both grids' overlapping row/column constraints. | Advanced |
| Twin Digit Counting | Each digit appears 9 times in Grid A and 9 times in Grid B, but only once in the shared box. This counting helps verify near-complete grids. | Advanced |
Average Solve Times
Easy
15 min
Medium
32 min
Hard
60 min
Expert
95 min
Frequently Asked Questions
How many cells are in a Cube/3D Sudoku puzzle?
153 valid cells — two 9×9 grids sharing a 3×3 overlap box (81+81-9=153).
Does the shared box count in both grids?
Yes — the shared 9 cells satisfy standard box, row, and column rules for both Grid A and Grid B.