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The basic tile size in Tracks is required to be a multiple of 6, which means that for small tile sizes the steps are rather large. With the standard border widths, this means that the default 8-by-8 puzzle can be 246 pixels wide (tilesize == 24) or 184 pixels wide (tilesize == 18). This is particularly annoying if you happen to have a 240-pixel-wide screen. This commit allows the puzzle to reduce or remove the borders at small tile sizes, on the grounds that a slightly narrower border is acceptable if it avoids needing to use a smaller tile size. It encodes the border width in (tilesize % 6), and is thus enabled when the default border width is 5 or less. Above that size (which is a tilesize of 48), I assume the steps in tile size aren't big enough to be a serious problem.
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/>.