Fill the grid so every row, every column and every 3×3 box contains the numbers 1 to 9 exactly once.
Tap a square, then tap a number. On a keyboard, use the arrow keys and type 1–9.
Switch to Candidate (or press N) to pencil in possibilities. Placing a number clears it from the candidates around it.
Tick Auto candidates to fill in every possibility for you. They stay up to date as you play.
Selecting a square highlights its row, column and box, and every matching number. Tap it again to deselect it.
With no square selected, tap a number at the bottom to highlight it everywhere on the grid.
Numbers that clash with another in the same row, column or box turn red.
531 4 769821 47
There are four new puzzles every day: Easy, Medium, Hard and Expert. Everyone gets the same ones. Solve a difficulty on consecutive days to build a streak.
Missed a day? Pick any of the last seven from the row of days at the top, or swipe it sideways. Solving a day later still counts toward your streak.
Each puzzle has exactly one solution and can be solved by logic alone, with no guessing.
Settings
Dark theme
Highlight row, column and box
Shade the squares that share a row, column or box with the one you select
Highlight matching numbers
Show every square and candidate with the same number as the one you select
Show clashes
Highlight numbers that repeat in a row, column or box