Duko — the logic puzzle game that evolves as you play

'Duko' is a puzzle game built on sudoku's rules but not its limits. Every row, column, and region must contain each symbol exactly once — but the symbols themselves change as you progress. Numbers give way to shapes, hieroglyphs, animals, emoji, and more. The further you play, the richer the game gets.

*Story mode — grow with the game*

Work through hundreds of progressively challenging logic puzzles that expand in every direction. Grids grow from compact 4×4 boards all the way to epic 12×12 challenges. Fewer clues over time means more thinking, more satisfaction. Beat a level to move on; replay any finished stage whenever you like. Your best time is always there to beat.

*Multiple unlockable symbol themes*

Numbers. Coloured shapes. Emoji. Egyptian hieroglyphs. Capital letters. Zodiac signs. Animals. Playing cards. And more. New themes unlock as you advance through story mode, so the game stays visually fresh long after you've mastered the rules. No other puzzle game grows quite like this.

*Daily mode — one brain game per day*

Open the calendar, play today's challenge, and build your streak. Each daily puzzle is stable and fair — finish tonight or come back tomorrow. Replay past days any time. A perfect offline puzzle to start or end your day.
Built for real players

Hints when you need a nudge
Lives, undo, and erase for forgiving play
Notes for candidate marking
Clear conflict feedback on the grid
Offline play — no internet connection needed
Portrait-friendly on phone; comfortable on tablet

Whether you want a quick brain game on your commute or a long relaxing puzzle session at home, Duko fits. Download free and see how far your logic can go.