Free browser tool · no upload required
Queens Puzzle Solver
Enter a 5×5–12×12 colored-region Queens board to find a solution and check whether it is unique. Queens must occupy one cell in every row, column and region, and cannot touch diagonally. This solves region Queens puzzles, not the chess N-Queens problem.
Choose a region number, then tap cells or drag to paint. Every cell needs a region; each of the 7 regions must connect through edges. Your board stays in this browser and is never uploaded.
Paint the regions, or load an example.
What the result means
The solver searches for up to two solutions. It stops after 250,000 search nodes or three seconds. A timeout is an incomplete search, not proof of impossibility.
This first version accepts hand-painted regions. It does not accept screenshots or an existing partial Queen layout, and it does not provide a human-style deduction for every input.