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Same Game doesn't want to show the keyboard cursor when the game is in a state where no move is possible. Previously, it did this by having game_changed_state() hide the cursor on entry to such a state. That meant that reaching a dead end and undoing out of it hid the cursor, which was confusing. Now the cursor is hidden in game_redraw() if the game is in a dead-end state without changing the displaysel flag in the game_ui. That way, if you undo out of a dead end, the cursor becomes visible again if it was visible before. This does mean that you can move the cursor in a dead-end state without being able to see where it's going. I think that's tolerable, but maybe the cursor keys should be disabled in that state as well.
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/>.