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The previous expression for WIDTH defined it, curiously, as (1 + (TILESIZE >= 16) + (TILESIZE >= 32) + (TILESIZE >= 64)) which is roughly logarithmic in tile size, but bounded above by a maximum of 4 pixels. On high-DPI displays this isn't really good enough any more. Now I've set the line thickness to a constant fraction of the tile size (but still bounded below by 1), so it's much easier to see the lines when the puzzle is expanded to extra large size.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.