Sightlines Solver

Sightlines Solver — Step by Step

Click a square and type its number (type two digits quickly for 10 and up). Then press Solve. Or play a generated puzzle and send it here with one click.

Sightlines Solver: rules, how to use it, tips

Shade some squares so every number sees exactly that many white squares along its row and column, counting itself.

The rules

Squares with numbers stay white.
A number counts the white squares visible from it — up, down, left and right — up to the first shaded square or the edge, including its own square.
Shaded squares never share a side.
All white squares are connected to each other through sides.

Using the solver

Choose the size and type the numbers (or press Sample).
Press Solve and step through: what each number must see, where its view must stop, and keeping the white squares joined.

Tips

Must see. If the other three directions can show at most 3 squares and the number is 6, it must see at least 2 squares in the fourth direction.
Seen enough. When a number already sees its total, the squares just past its views are shaded.
Next to shaded. Every square beside a shaded square is white.
Stay joined. Never shade a square that would cut the white squares into two groups.

The full guide, with a worked example and common mistakes: How to play Sightlines.

Questions

Do numbers see diagonally?

No — only along their row and column.

Is there always one answer?

Yes — every puzzle here is checked to have exactly one solution.

What do the dots mean?

A dot marks a square you know is white. It is optional but helps you keep track.

How do I solve one from a book?

Open the Sightlines Solver, type the numbers and press Solve.