I'd like to have a menu at the beginning of a game, which I've managed, but I'd like to have the "Play" button light up when the mouse is over it. I'm not sure how to do this, and whether I should have the button be on the background, or just add it as an object, and then what to do from there.
You have two options for the menu - make the options as hotspots and make them as objects. To light up a button you should use the Mouse over plugin by Sylpher but it doesn`t work in the latest version of AGS.