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Queens

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7×7

One queen in every row, every column and every colour region. Queens may not touch, not even at a corner.

Tap once for an ×, twice for a queen, again to clear. Drag to paint ×s. Every puzzle has one answer, reachable by logic alone.

Keys: arrows, Space, X, Q, H for a hint, Ctrl+Z.

Setting the board…

Solved!

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Place one queen in every row, every column and every colour region.
Queens may not touch each other, not even at a corner.
Tap once for an × (“no queen here”), twice for a queen, three times to clear. Drag to paint ×s.
Every puzzle has exactly one answer, and you can always reach it by logic, without guessing. Stuck? A hint shows the next deduction and why.

Keyboard: arrows move, Space cycles, X marks, Q places, H hints, Ctrl+Z undoes.

Auto-×When you place a queen, mark every cell it rules out. Removing the queen takes them back.