Solve six connected 9×9 Sudoku faces. Every row, column and 3×3 block on each face must contain the digits 1–9 exactly once.
Start with 4×4, build confidence with 6×6, and explore 9×9. Younger children can begin with a parent.
Built for puzzle enthusiasts seeking more depth than standard flat 2D Sudoku boards.
Solve six connected 9×9 Sudoku faces. Every row, column and 3×3 block on each face must contain the digits 1–9 exactly once. An edge cell belongs to two faces and a corner cell to three. Its value must satisfy the rows, columns and blocks on every face it belongs to.
Get intelligent step-by-step logical hints when stuck, with real-time error detection, conflict highlighting, and auto-pencil candidates.
Compete against your best times, build win streaks, complete daily 9×9 puzzles, and track detailed performance analytics.
Embark on 4 progressive chapters from Starter to the Decade of Cubes, unlocking star ratings and mastering new 3D strategies.
Earn achievements for flawless solves, speed runs, and 7-day, 30-day, or 365-day daily challenge streaks.
Each puzzle has a QR code. Scan it, or click it in the PDF, to open the same cube at play.cubesudoku.com with the printed starting digits already loaded. No manual copying needed.
If you know standard 9×9 Sudoku, you are 90% ready. Here is how 3D spatial continuity changes the puzzle!
Along the shared seam, both faces must have identical numbers in matching order (e.g. 1, 4, 2, 3).
The corner cell is physically shared by 3 perpendicular faces and must contain the exact same digit (1) on all three.
Cube Sudoku 3D consists of 6 interconnected Sudoku faces. Numbers 1 to N cannot repeat in any row, column, or block. Edge cells belong to 2 faces (corners to 3) simultaneously!
Orbit freely in 3D, double-tap to snap to any face, turn the view by 90° for easy reading, or switch to 2D (the active face flat, with strips of its neighbours) or 2D + 3D.
Enter digits in Normal mode, write Pencil Notes (N), or use Digit-First fast-fill mode to quickly paint numbers across empty cells.
Stuck on a tricky cell? Smart Hint explains the exact logical deduction step-by-step. Error highlighting and conflict detection stop mistakes early.
One-time purchase for play.cubesudoku.com. No subscription, works in up to 5 browsers.
Play in browser immediately with core features
Complete power toolkit for dedicated puzzle solvers
All Web Pro features plus five printable PDF books
Web Pro unlocks play.cubesudoku.com only. Pro purchases for mobile and store apps are separate.
Clear answers about Cube Sudoku 3D mechanics, offline play, and availability.
Yes, the core puzzle experience is free. There are no sudden fullscreen popup ads interrupting your solve in the middle of a game.
Yes, all puzzle generation, logic validation, and smart hint algorithms run locally on your device without an internet connection.
Cube Sudoku 3D offers 4x4 for quick sessions, 6x6 for balanced logic and the full 9x9 cube, each with four difficulties from Easy to Extra Hard.
An edge cell belongs to two adjacent faces, and a corner cell belongs to three perpendicular faces. A digit placed there must satisfy row, column, and block rules for all faces it touches.
Yes, our official WebAssembly edition runs directly at play.cubesudoku.com with fast loading and zero installation needed.
Yes. Vector PDFs support double-sided printing on Letter or A4 paper. Large 5.5 mm cells leave room for pencil notes.
Web Pro is a one-time purchase, not a subscription. At play.cubesudoku.com it unlocks unlimited Smart Hints, auto pencil candidates, detailed solving statistics and printable PDFs of any cube. You can activate your license key in up to 5 browsers at once, and it keeps working offline for up to 7 days.
Yes. Scan the QR code beside the puzzle, or click it in the PDF. In your browser, the link opens that exact cube at play.cubesudoku.com with the same starting digits as the book. You can rotate it in 3D and continue solving without copying the digits. Pencil entries you add on paper are not imported automatically. Basic play works without Web Pro.
Android phones and tablets
Install the game on your Android phone or tablet.
play.cubesudoku.com
Play instantly on your phone, tablet or computer. Start free with 4×4, 6×6 and 9×9 puzzles.
