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How to Play
Fill every row, column and box on all six faces so no digit repeats.
Drag the cube to turn it. Tap a cell, then tap a digit (or type it).
Use Notes to pencil in candidates, Undo to step back, and the face rail to jump straight to a side.
Stuck? Hint fills the next logical cell and explains the reasoning.
💡
Tap a cell, then a digit. Drag the cube to turn it.
Dealing the cube…
Cube solved!
★★★
Every face filled and every rule respected.
Start a new cube?
Your progress on this cube will be cleared.
Turn your device uprightA Sudoku cube needs the full height of the screen — landscape leaves the grid too small to read.
3D Sudoku
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Difficulty
Controls
How to Play
Goal
Six Sudoku grids, one on each face of a cube. Fill every row, column and box on all six faces so that no digit repeats — the cube is solved when all 36 units are complete.
Controls
Drag the cube to turn it, or use the face rail above the board to fly straight to any side.
Tap a cell, then a digit (or type 1–9) to place it. Tap the same digit again to clear it.
Notes (N) turns digits into pencil marks; Candidates (C) shows what is still possible in each empty cell.
Undo / Redo step through every entry (Ctrl+Z, Ctrl+Shift+Z).
Arrow keys move between cells, [ / ] change face, H returns to the home view, Esc deselects.
Hint fills the next cell that can be proved by logic and tells you the reasoning — naked single, hidden single, pairs or box-line reduction.
Difficulty
Easy is a 4x4 grid per face, Medium 6x6 and Hard 9x9 — and every cube is generated with a unique solution that can be reached without ever guessing.
Tips
Work one face at a time: use the face rail to bring a side square-on, solve what you can, then move on.
Turn on Candidates when you are stuck — a cell with a single remaining candidate must take that digit.
A digit is finished when its counter on the pad reads 0; that is a good moment to sweep the cube for the last few.
About 3D Sudoku History, Strategy & Tips
3D Sudoku takes the familiar number-placement puzzle and wraps it around a cube. Each of the six faces is its own Sudoku grid, and your goal is to fill every row, column and box on every face so that no digit repeats within any of them — while rotating the cube to reach each side.
If you can solve flat Sudoku, you have the skills for 3D Sudoku. The added dimension is spatial: six grids share one object, so you turn the cube, focus a face, and work through them one at a time. Six completed faces solve the cube.
The History of 3D Sudoku
Sudoku itself was designed in 1979 by Howard Garns and popularised in Japan in the 1980s. 3D Sudoku is a modern variant that uses browser-based 3D rendering to lay six grids on the faces of a single cube, so you solve it by virtually turning the object in your hands.
The core logic is unchanged — no digit may repeat in a row, column or box — but the cube format turns one grid into six, and each face stays a self-contained puzzle. What changes is the workflow: rotate, focus a side, and clear it before moving on.
Solving Strategies
Solve one face at a time
Rotate to a face and solve it like a flat Sudoku first — scan for naked singles, use pencil marks, and fill what you can. Then turn to the next face and repeat. Crossings between faces will confirm or correct your work.
Use the face rail, not the mouse
Bringing a side square-on with the face rail makes every cell the same size and removes the guesswork of tapping a foreshortened square. Work a face flat, then turn to the next one.
Let the counters guide you
Every digit on the pad shows how many of it are still unplaced across the whole cube. A digit that reads zero is finished — and the last copy of a digit is usually the easiest cell on the board.
Look for naked singles
A cell with only one possible candidate (after eliminating the digits in its row, column, and box) must hold that digit. Hunt for these — each one cascades into new eliminations.
3D Sudoku FAQ
Do I need to know flat Sudoku first?
It helps, but is not required. The rules are the same — the 3D cube just adds rotation and multiple connected faces.
How do I place a number?
Tap a cell, then tap a digit on the pad — or type 1–9. Drag the cube to turn it, or use the face rail to jump to a side.
Are the faces independent or connected?
Each face is a complete, independent Sudoku grid with its own unique solution. The cube is solved when all six faces are filled correctly.
How does difficulty change?
Easy is 4×4 per face, Medium 6×6 and Hard 9×9 — with progressively fewer clues. Every cube is verified to have exactly one solution that can be reached by logic alone.
What if I get stuck?
Use Notes to pencil in candidates, Candidates to see what is still possible, or Hint — it fills the next provable cell and explains the technique it used.