display_mouse_get_y()
From YoYoGames Wiki
Description
This function returns the y position of the mouse within the entire display of your screen
Returns
- (integer): y-position of the mouse
Explanation
This function returns the y position of the mouse within the entire display of your screen. If you want the value to be relative to the game window, use window_mouse_get_y. And if you want the value to be relative to the room itself use the variablemouse_y.

