Sudoku

How to play

1. Fill the 9 by 9 grid so that every row, every column and every 3 by 3 box holds the numbers 1 to 9 once.
2. Tap a cell, then a number. Numbers in a clash in a row, column or box are marked, other wrong numbers are not.
3. Notes lets you write small candidates into a cell. Hint fills in the right number for the selected cell.
4. Keyboard: 1 to 9 place a number, P switches notes, H gives a hint, arrow keys move.
5. A new Sudoku every day, easy, medium or hard. The arrows next to the date take you to earlier days.