If I had to guess, I'd say you type "define config.mouse" in the options.rpy? How exactly would you refer to your image file.Ren'Py Documentation wrote: define config.mouse = None
This variable controls the use of user-defined mouse cursors. If None, the system mouse is used, which is usually a black-and-white mouse cursor.
Otherwise, this should be a dictionary giving the mouse animations for various mouse types. Keys used by the default library include "default", "say", "with", "menu", "prompt", "imagemap", "pause", "mainmenu", and "gamemenu". The "default" key should always be present, as it is used when a more specific key is absent.
Each value in the dictionary should be a list of (image, xoffset, offset) tuples, representing frames.
define config.mouse = ???