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The code that actually executes the moves can only cope with moves of at most the width (or height as appropriate) of the grid. Reject any longer move, and for symmetry also negative moves of the same magnitude. Without this, the tile-moving code tends to access off the start of the tile array. To demonstrate this, build Sixteen with AddressSanitizer and load this save file: SAVEFILE:41:Simon Tatham's Portable Puzzle Collection VERSION :1:1 GAME :7:Sixteen PARAMS :3:4x4 CPARAMS :3:4x4 DESC :38:2,16,3,10,13,8,7,4,9,14,12,11,15,1,5,6 NSTATES :1:2 STATEPOS:1:2 MOVE :4:C1,9
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/>.