How to play

Fill the grid so every row, every column and every 3×3 box holds the digits 1 to 9 exactly once.

• Tap a square, then tap a number. Notes lets you pencil small candidates instead.
• Auto notes fills every square’s candidates for you; placing a digit then clears it from its row, column and box.
• Hint names the next technique and shows where to look. Tap again to do it.
• A number key with a small 0 means all nine of that digit are placed.
• With the 3-mistake limit on, a wrong digit counts as a mistake.