Four Grids at the Same Level
Four grids of the same level, one after the other, train a precise reflex: at Easy, crossing out the neighbors of each star; at Medium, spotting two regions inside two lines; at Hard, choosing the right cell to test.
Readable at a Quarter Page
The regions stay outlined in thick lines, and each cell keeps room for a pencil dot or a star, even with four grids on the page.
After the 6x6 Sheets
When a Hard sheet of 6x6 grids feels easy, the 7x7 and 8x8 grids bring more regions. The single 6x6 grids, one per page, are on the 6x6 Star Battle page.