I'm making a touch screen game where you're making a sandwich by catching falling ingredients.
In the game you are given an image that prompts you to make the shown sandwich which is shown for a few seconds and then vanishes and the sandwich ingredients begin to fall from the top of the screen.
I know I might need to make several possible sandwich pictures and it should be on it's own layer, what I need to know is how can I have the image pop up randomly and does it need to be a tiled background or a sprite?
Thanks!