Queens

How to play

• Place one queen in every row, every column and every coloured region.
• Two queens may never touch, not even diagonally.
• Every puzzle has exactly one solution, and you can find it by logic without guessing.

Using the game

• Tap a cell once for a cross (no queen can go here), twice for a queen and a third time to empty it.
• Drag across several cells to cross them all out at once. Start dragging on a cross to remove crosses instead.
• Queens that clash turn red.

Difficulty

• Easy: 7 × 7 cells. You get far by crossing out around the queens and looking for rows, columns and colours with a single cell left. 2–5 minutes.
• Medium: 8 × 8 cells. Somewhere you need to see that two or three colours together fill just as many rows or columns. 5–10 minutes.
• Hard: 9 × 9 cells and more of those steps in a row, sometimes also testing what a queen would rule out. 10–20 minutes.

Keyboard

• Arrow keys: move between cells
• Space / Enter: empty → cross → queen → empty
• Q: place or remove a queen
• X: place or remove a cross
• Backspace / Delete: empty the cell
• Ctrl + Z or U: undo
• H: hint
• P: pause

Questions

Where does the puzzle come from?
The rule builds on the classic eight queens problem on a chessboard. This version and its puzzle generator are our own.

Is there always a unique solution?
Yes. Every puzzle is made here and checked so that it can be solved by logic all the way. That means there is only one solution.

Is my puzzle saved?
Yes, in this browser. You can close the page and continue later.

Can I play the same puzzle as a friend?
Yes. Tap the puzzle code and send the link.

Questions and answers

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