Place one queen ♛ per row, per column, and per coloured region. No two queens may touch — not even diagonally.
What a queen blocks
When you place a queen it eliminates every other cell in its row, in its column, in its colour region, and the eight cells immediately around it. Mark blocked cells with · so you can see what's left.
Key deductions
One valid cell. If a region only has one cell that hasn't been eliminated, the queen for that region must go there.
Region in one row. If a region's available cells all sit in the same row, that row is reserved for that region's queen — every cell in that row from any other region can be marked off.
Shapes have secrets. If a cell would be attacked no matter which cell of a region gets the queen, mark it off. For an L, that's the inside corner and the cell in line with each arm. Bars, pairs and T's each have their own — watch for shapes that repeat.
Controls
Tap a cell: empty → · mark → ♛ queen → empty
Drag across cells to sweep-mark
Hint (or H) suggests the next logical step; press Space to apply it
Undo (or U) reverses your actions one step at a time, back to a fresh board
Stuck on a wrong placement? Ask for a hint — the engine will flag the queen that doesn't fit the unique solution
Queens
One queen per row, column & coloured region — no touching
Pick a different puzzle each time you open the page. Off = always start at the lowest seed of the chosen difficulty.
Auto-mark every cell a queen attacks (its row, column, region, and adjacent cells) the moment you place it.
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Generating…
♛
Puzzle solved!
Tap to cycle · → ♛ → empty · Swipe to sweep-mark cells · H hint, C check, Space apply, U undo, N new, R reset