A Queens puzzle looks simple at first: place a few queens on a colored grid.

Then the constraints start interacting.

A queen placed to satisfy one region may block an entire row, eliminate a column, or make two other queens touch. What begins as a small placement game quickly becomes a satisfying constraint-solving challenge.

That is why I built QueensGamers.com: a free browser-based place to play colored-region Queens puzzles, from quick daily boards to much larger challenges.

How the game works