In Sightlines every number is a lookout. From its square it looks up, down, left and right, counting white squares until it meets a shaded square or the edge — and the total, including its own square, must equal the number.
Shade squares to block the views. Two shaded squares may not share a side, and the white squares must all stay connected in one piece.
A big number in a small grid needs long views, so its neighbours are white; a small number needs its view blocked close by.
Shade some squares so every number sees exactly that many white squares along its row and column, counting itself.
The full guide, with a worked example and common mistakes: How to play Sightlines.
No — only along their row and column.
Yes — every puzzle here is checked to have exactly one solution.
A dot marks a square you know is white. It is optional but helps you keep track.
Open the Sightlines Solver, type the numbers and press Solve.