Queens Solver Online

What is a Queens solver?

A Queens solver is an online crown puzzle tool that completes a Queens grid from its coloured regions and any crowns or X marks you have already entered. The solver checks the standard rules: every row, column and region needs the selected number of crowns, and crowns cannot touch, even diagonally.

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• Solve Queens puzzles from apps, screenshots, books or printable sheets.
• Check whether your current crowns and X marks are still possible.
• Reveal the next logical Queens move without showing the full solution.
• Test handmade Queens region layouts for one solution or multiple solutions.

How to use this Queens puzzle solver

Choose the grid size and crown count first. In Regions mode, choose a colour from the palette and paint the grid so it matches your puzzle. In Crowns / Xs mode, click a cell and set it to blank, X or crown.

Press Solve to complete the puzzle. Press Check to confirm that your entries can still fit at least one valid answer. Press Next move if you want a hint that shows candidate cells and highlights one forced crown or forced X.

• Start from a blank grid if you want to copy a puzzle by hand.
• Load an example if you want to see the solver workflow immediately.
• Each region colour must appear at least once.
• Known crowns are treated as fixed givens.
• X marks are treated as cells that cannot contain crowns.

Queens rules used by the solver

The solver uses the common Queens crown puzzle rules. If you choose 1 crown, every row, every column and every coloured region must contain exactly one crown. If you choose 2 or 3 crowns, those same counts rise to two or three.

Crowns may not touch horizontally, vertically or diagonally. This no-touching rule is what makes Queens different from a simple counting puzzle: one crown can eliminate up to eight neighbouring cells at once.

• Every row has exactly the selected number of crowns.
• Every column has exactly the selected number of crowns.
• Every coloured region has exactly the selected number of crowns.
• Crowns cannot touch, including diagonal contact.
• Entered X marks block cells from being used in a solution.

Next move logic and Queens strategy

The Next move helper first builds a candidate map. It removes cells blocked by X marks, cells that would touch a known crown, and cells that cannot fit the row, column or region counts.

After solving the remaining possibilities, it looks for a move that is true in every valid solution. If a cell always contains a crown, it is a forced crown. If a cell never contains a crown, it is a forced X.

• Use row and column counts before guessing.
• Use region counts to find colours with too few remaining spaces.
• After placing a crown, mark every touching square as impossible.
• In two-crown and three-crown puzzles, count remaining crowns in each line carefully.
• If Next move only shows candidates, the puzzle may need a deeper branch or a full solve.

Why a Queens puzzle may have no solution

A Queens puzzle can become impossible if a row has too many crowns, if a crown touches another crown, if a region has too few available cells, or if an X mark blocks every possible place for a needed crown.

A handmade Queens puzzle can also have multiple solutions when the coloured regions do not force a unique crown layout. The solver reports that case so you can add clues, adjust regions or keep solving with the first valid answer.