How to play Expert Queen Puzzle (10×10)

Place one queen in every row, every column and every coloured region. Two queens never touch, not even diagonally. Every puzzle has exactly one solution, and you never need to guess.

How to mark the board

• Tap a cell for a cross (no queen here), and tap again to clear it. Double-tap for a queen.
• Hold and drag to cross out several cells at once.
• Turn on Auto × if you want the cells a queen rules out crossed out for you.
• Hint shows the next step and why it works. You have three per puzzle.

A good first move

Look for the smallest region. If all its cells lie in one row or column, that row or column belongs to it, so you can cross out the rest of that line.