How to play

• Fill the grid so that every row, every column and every 3×3 box holds the digits 1 to 9 once each.
• Pick a square, then a digit. Turn on Notes to pencil in the digits a square might hold.
• Not sure? Press Try to test a hunch, then keep it or throw it away.
• Stuck? Hint fills in a square for you.
• The clock starts when you press Start.