namlabs
Sudoku, clean and clear.
Classic 9×9 Sudoku with 300 handcrafted levels, a fresh daily challenge and hints that teach you the technique instead of just giving the answer.
See it in action
Swipe through the screens.
Why you'll love it
300 levels
Climb from gentle warm-ups to expert grids and earn up to 3 stars on each one.
Daily challenge
A fresh puzzle every day, the same for every player. Keep your streak alive.
Hints that teach
See the technique you can use right now (singles, pairs, X-Wing and more) with the cells highlighted.
Fast, smart input
Lock a digit and tap to fill, auto-fill the last cells, pencil marks and unlimited undo.
Easy on the eyes
Big clear numbers, adjustable text size and a proper dark mode.
Plays offline
No internet needed. English, Vietnamese and Japanese, on phones and tablets.
How to play
New to Sudoku? Read the full beginner guide →
Fill the grid
Place digits 1–9 in the empty cells of the 9×9 board.
One per row
Each row holds every digit from 1 to 9 exactly once.
One per column
Each column holds every digit from 1 to 9 exactly once.
One per box
Each 3×3 box holds every digit from 1 to 9 exactly once.
Learn the techniques
The same moves the in-game hints teach, with worked examples. All techniques →
Naked single
A cell whose peers already use eight different digits.
BeginnerHidden single
A digit that fits in only one cell of a row, column or box.
IntermediateNaked pairs
Two cells, two candidates: clear them from the rest of the house.
IntermediatePointing pairs
A box's only spots for a digit point along one row or column.
AdvancedX-Wing
Two rows, two columns, one digit: a rectangle that clears columns.
Four difficulty levels
From your very first Sudoku to a real brain workout.
Ready for today's puzzle?
Free to play with ads. A one-time purchase removes all ads.
