Nanro Signpost Instructions

The objective is insert numbers, subject to the following rules:

1. Each area must contain at least one numbered cell.
2. Numbers in some cells count the total of numbered cells in that area, however that cell may not contain a number upon completion.
3. Where two numbers connect across a boundary between areas, those numbers must be different.
4. Numbers must form one connected area with no 2x2 areas of numbered cells.