A queen attacks along straight lines and diagonals, as far as the first piece she meets. In this drill you tap every black queen that could take the white king right now. Find them all and the next board appears.
Get five boards in a row right for a silver star and ten in a row for gold. A wrong tap shows you the answer and starts your count again. Harder levels hide queens behind other queens.
Tip: trace each of the eight lines out from your king and stop at the first queen you meet. That one is attacking you; anything behind it is blocked.