Hard Cube/3D Sudoku
Score
0
Mistakes
0/3
Time
00:00
Grid A
Grid B
2
4
8
3
5
4
2
7
5
1
4
4
2
9
1
9
5
8
7
9
1
8
6
3
7
8
6
2
4
2
9
3
4
7
9
6
9
3
1
9
5
2
5
9
3
4
2
5
2
7
1
Grid A
Shared
Grid B
Hard · Cube/3D · 2 grids (153 cells)0%
How to play Cube/3D Sudoku
Two 9×9 Sudoku grids overlap at a shared 3×3 corner box. Grid A (blue tint) covers rows 1–9, columns 1–9. Grid B (green tint) covers rows 7–15, columns 7–15. The shared box (rows 7–9, cols 7–9) satisfies both grids. Each grid must independently satisfy standard Sudoku rules.
About Cube / 3D Sudoku
Difficulty
★★★★☆
4/5
Constraint Type
Twin Grids
Typical Givens
~30 per grid
Avg. Solve (Medium)
32 min
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.
Solving Techniques
| Technique | Description | 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 Time by Difficulty
Easy
15 min
Medium
32 min
Hard
60 min
Expert
95 min