Colored N-Queenslogic puzzle

Place one queen in every row, every column and every colored region. Queens can't touch each other — not even diagonally. That's it: unlike chess, a queen here only guards the eight squares around her.

Every board has exactly one solution and can be finished by pure deduction. No guessing is ever required — and Hint will show you the next logical step and explain why.

• tapCycle a square: empty → × (ruled out) → ♛ queen → empty.
• dragSweep across empty squares to × them all at once; sweep from an × to erase.
• hold / right-clickDrop a queen straight away.
• keysArrows move · Space cycles · Q queen · X mark · Backspace clear · U undo · H hint.

Auto-X greys out every square a placed queen already rules out, so you can see what's left. On the biggest boards a queen or two comes pre-placed (dashed ring) — they're part of the puzzle and can't be moved.