How to play Fenced Field

Fence in one field so that every number is inside and sees exactly that many field squares across and down. Also known as Fence puzzle.

The rules

Choose which squares are in the field. One fence goes around them.
Every number is inside the field.
Each number counts the field squares it can see in straight lines across and down, including itself. The fence stops its view.
The field is one piece and has no holes: every outside square can reach the edge of the grid.

Choose a grid size and difficulty, then press New Puzzle.
Tap or drag to add squares to the field; use the Outside tool (or right-click) to mark squares outside. The fence is drawn round the field for you.
Every number is in the field and counts the field squares it can see in straight lines across and down, itself included — the fence blocks its view.
The field is one piece with no holes. Hint explains the next square.

A 2 sits in a corner. It sees itself, so it needs exactly one more field square — either the one beside it or the one below.

If a 5 is right next to it, the 2 already sees that 5 — so the square below the 2 must be outside.

Small numbers stop early. A 1 can’t see anything else — all four neighbours are outside.
Big numbers spread. If a number needs more squares than it could see in the other directions, the rest must come from this way.
Numbers see numbers. Two numbers in line with nothing between them see each other — count that.
No holes. An outside square surrounded by field would be a hole — it must be in the field, or have a way out to the edge.

Loop-and-visibility puzzles like this appear in Japanese and Western puzzle collections under several names. This version always has a unique answer.

Do numbers count themselves?

Yes — a number sees itself, so the smallest possible number is 1.

Can the field touch the edge of the grid?

Yes — the fence can run along the edge.

Is there always one answer?

Yes — every puzzle is checked so that logic alone finds the field.