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A user reports that trying to generate a 2x2 or 3x3 puzzle at Tricky difficulty causes the generator to hang, for the usual reason that there aren't any - puzzles of that size are either ambiguous or Easy. The usual response in this code base is to quietly downgrade the puzzle difficulty when absolutely necessary, so here's some code to do that (and also for 2x3, which the user didn't test, but unsurprisingly behaves the same way).
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/>.