About the Queens Puzzle
The board is split into coloured regions, one per row. Your job is to place a queen so that every row, every column and every region holds exactly one, and no two queens touch — not even at a corner. It is a relative of the classic eight-queens problem and of Star Battle, and it is the same rule set that LinkedIn’s daily Queens made popular.
Boards here are built around a hidden queen layout, then the region borders are adjusted until that layout is the only one that fits. Every board has exactly one answer, so it never comes down to a coin flip. The daily board is eight by eight; practice boards run from seven to nine.
Strategy tips
- Start with the smallest region. A region that sits entirely inside one row or column claims that line, so cross off the rest of it.
- Two regions confined to the same two rows own those rows between them. Every other square in the pair of rows is empty.
- A queen rules out its whole row, column and region, plus the eight squares around it. Cross them all before looking for the next placement.
- Test a candidate square by asking whether it would wipe out every square of some other region. If it would, it is not a queen.
- Crosses are cheap and mistakes are not; marking what is impossible is most of the work.
Controls
Tap a square once to cross it out, twice to place a queen, and a third time to clear it. Queens that break a rule turn red straight away. For binary grid deduction, try Binairo; for picture logic, try the Nonogram.