A grid of 81 squares split into nine 3×3 boxes. Some numbers are filled in for you.

There are three new puzzles every day: Easy, Medium and Hard. Pick one at the top.

The rule

Fill every empty square so that each row, each column and each 3×3 box contains the numbers 1 to 9 exactly once.

How to play

• Tap a square, then tap a number. Tap a different number to change it.
• Notes lets you jot small possible numbers in a square while you think.
• Undo, Erase and Hint are there when you need them. A wrong number shows in orange.
• Squares in the same row, column and box as your selection are shaded, so you can spot clashes.

Tip: look for a row, column or box that is missing only one or two numbers, and fill those first.