Sudoku

Fill the grid with numbers and wake the sleepy friends in their dens.

How to play

• Every row, every column and every box holds each number exactly once.
• Each box is a den. Fill a den and a sleepy friend wakes up.
• A wrong number costs one of your three hearts. Lose all three and the puzzle starts again.
• Relaxed mode (in Settings) has no hearts and checks nothing until the grid is full.
• Three stars for a puzzle with no hearts lost and no hints. A hint or two caps it at two stars, and lots of hints at one.

Controls

• Tap a square, then a number.
• Turn on Notes to pencil in ideas. Auto notes fills them in for every empty square, for free.
• With a keyboard: arrow keys move, Space selects, a number fills, Shift and a number writes a note, N switches notes, Backspace clears, Ctrl and Z undoes.

Tips

• Look for a row, column or box that is nearly full: the missing number often has only one place to go.
• Small boards come first: 4 by 4, then 6 by 6, then the classic 9 by 9.

Questions

Is it free?

Yes. Every daily puzzle is free, plus 10 levels a day.

Does every puzzle have one solution?

Yes. Every board has exactly one solution, and you can always reach it by logic, no guessing needed.

How hard is the daily?

It gets harder from Monday to Saturday. Sunday is a gentle one.

Do notes cost anything?

No. Notes and auto notes are free and never count as hints.