Shapedoku

How to play

1. 1Tap an empty cell to select it, then tap a shape to place it.
2. 2Every row, every column and every 3 by 3 box must contain each of the nine shapes exactly once.
3. 3Use notes to pencil in candidates, and a hint when a board has you stuck.
4. 4Three mistakes end a classic game, so place with care.
5. 5Fill the whole grid correctly to solve the puzzle.

What makes it special

• Nine distinct shapes, easy to tell apart and friendly to colourblind players
• Four difficulties, from a relaxed Easy to a serious Extreme
• A fresh Daily Challenge every day, with a streak to keep alive
• Challenge modes: Speed, No Mistakes and Perfect Run
• Notes, smart-cleanup and hints to help with harder boards
• XP, levels and online leaderboards when you sign in
• A free solver and a printable generator on the website

Tips and strategy

• •Scan for shapes that already appear often; they are usually the easiest to place next.
• •Use notes early on hard boards so you never lose track of a cell's candidates.
• •Work a single 3 by 3 box or a single row to the end before jumping around.

Frequently asked questions