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I've rewritten tile_redraw to reduce the number of calls to draw_rect(). Before, it would generally make five calls to draw_rect() when drawing a tile. Now it makes at most three, and usually two. That's one draw_rect() for each colour that appears in the tile, which is as good as it can get. This reduces the time to draw a large puzzle by about 35% on Firefox 102. This is of significance to me because CanvasRenderingContext2D on my test KaiOS device seems to have a limit on the number of fill() and fillRect() calls that it will tolerate in a short time. This means that if you issue more than 1024 fillRect() calls in rapid succession, the later ones are simply ignored. Same Game's largest preset called draw_rect() so much that it hit this limit. That meant that the right-hand side of the grid didn't get properly drawn when starting a new game. Now that it is less profligate with draw_rect() it fits comfortably within the limit and I get to see the entire grid.
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/>.