3Doku | Sudoku goes 3D

It's sudoku. It just isn't flat anymore.

3Doku wraps the puzzle you already know around a shape you can see all sides of. Each face is a normal 3×3 box, filled with 1 to 9, exactly like always. The difference is that the lines carry on around the corners, so a number you place on one side quietly rules something out on another.

It reads strangely for about a minute. Then it clicks, and it's very hard to put down.

WAYS TO PLAY • Classic 3Doku | a brand new shape every single game, from easy to expert • 3Doku Levels | 100 puzzles that start small and get gloriously out of hand • 3Doku Chain | beat the clock. Every piece you finish adds more puzzle and more time. See how far you get. • Classic Sudoku | the flat 9×9 you grew up with, right up to extreme

PLAY WITH OTHERS • Versus | same puzzle, everyone at once, and a bar at the top showing who's ahead • Co-op | one puzzle, solved together, your friends' numbers appearing as they go • Share a room with a code or a quick QR scan. Keep a room for your regulars and it'll be waiting next time.

LEADERBOARDS Daily, weekly and monthly — for regular puzzles and for Chain runs.

YOUR LIBRARY Every Chain run and every best time is saved as a picture of the finished puzzle. A shelf of everything you've solved.

LITTLE THINGS THAT HELP • Pencil notes, a nudge when two numbers clash, and a way to fill several cells at once • Notes that tidy themselves up, finished numbers that fade away | every helper is a switch, and you decide • Light and dark • English and German • Play on your own anywhere, no internet needed • No ads

Free to start: classic puzzles on easy and medium, and you can always join a room a friend opens. One unlock gets you the rest | every difficulty, all 100 levels, Chain, your own rooms, and your library. You pay once and it's yours. No subscription, nothing to renew.