I started making an XNA game years ago and picked it up recently.
I'm looking later to convert it to use Monogame so that it can be deployed on various mobile devices and OS, though I have a sinking feeling that a lot of the sprites and code will be broken by the changing screen sizes when I move outside of the emulator.
The game is currently hard coded to to 800x480 and the level placements and sprite sizes were all done to fit that at the time.
So question:
What do I need to ensure this works and displays properly on a variety of screens and devices?