CubeSweeper — Eigene

What is CubeSweeper?

CubeSweeper is Minesweeper played on a rotating 3D cube. The board is divided into six N×N faces. Cells connect across face boundaries with full 8-connectivity — edge-crossing and corner-crossing both work — so the cube surface is one continuous minesweeping space with no breaks or seams.

Each corner of the cube is shared by three faces. Corner cells there see 7 unique neighbours (3 on their own face, 2 each from the two adjacent faces, and the one shared corner cell from the third face). Every other cell sees exactly 8 neighbours regardless of which face it's on.

How to Play

• Drag the cube to rotate it and inspect any face.
• Left-click a cell to reveal it. Empty cells (0) auto-expand through all connected empty neighbours, including across face boundaries.
• Right-click a cell to place a flag (🚩). Right-click again for a question mark (?), and a third time to clear it.
• The Flag button puts you in flag mode — left-clicks will cycle flags instead of revealing cells.
• The ↺ button resets to a fresh board. Your timer starts on your first click.
• Win by revealing every non-mine cell. All remaining mine cells are flagged automatically when you win.

Board Sizes

• Beginner — 9×9 per face, 486 total cells, 60 mines (~12%). Numbers-only solving; no-guess mode available.
• Intermediate — 16×16 per face, 1536 total cells, 240 mines (~16%). Requires tracking constraints across multiple faces. No-guess mode available.
• Expert — 30×30 per face, 5400 total cells, 1050 mines (~19%). A marathon board designed for extended play. No no-guess mode.
• Custom — Set your own grid size (N×N per face) and mine count.

No-Guess Mode

When No-Guess is enabled (Beginner and Intermediate only), the board is generated so that it can always be solved using logic alone — no guessing required. The generator uses constraint propagation and retries up to 200 times to find a solvable layout. If no solvable board is found within the limit, it falls back to a standard random board.

Strategy Tips

• Rotate constantly. Information on the far side of the cube is just a drag away. A cell with a high number might be easily solvable once you see the face behind it.
• Use the Far button. Hiding numbers on the back face reduces visual noise while you work through the front.
• Track face crossings. A chain of empty cells can cross an edge and reveal cells on a different face. Follow auto-expand results to see the full picture.
• Corner cells are tighter. A corner cell has only 7 neighbours instead of 8. A high number on a corner cell is a stronger constraint than the same number on an interior cell.
• Expert is a marathon. Don't expect to finish in one sitting. Focus on local constraints and make steady progress across the cube surface.