Fence Regions Solver

Fence Regions Solver — Step by Step

Choose the grid and region size, click a square and type its number, then press Solve. Or play a generated puzzle and send it here with one click.

Fence Regions Solver: rules, how to use it, tips

Draw fences along the grid lines to split the grid into regions of the same size, with each number counting the fences around its square.

The rules

Every region has exactly the given number of squares, joined side by side.
A number says how many of its square’s four sides are fences.
The outer edge of the grid counts as a fence.
Every square belongs to exactly one region.

Using the solver

Choose the grid and region size and type the numbers (or press Sample).
Press Solve and step through: fence counts, full regions and region shapes.

Tips

Corners and edges. A corner square already has two fences from the edge; a 2 there means it is open inwards on both sides.
Zeros and fours. A 0 square is open all round; a 4 square is a region on its own — only possible with regions of 1.
Full regions. Once a region has all its squares, fence it all round.
Too big. Never join two groups whose sizes add up to more than one region.

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

Questions

Do regions have to be the same shape?

No — only the same size. They can be any shape, as long as their squares are joined side by side.

Does the edge of the grid count?

Yes — it counts as a fence for the numbers.

Is there always one answer?

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

How do I solve one from a book?

Open the Fence Regions Solver, choose the region size, type the numbers and press Solve.