I'm currently in the middle of my first game, and starting to import sprites. I'm using a resolution of 640x400 and when I go to import a sprite, there's a checkbox asking whether I want to "Import for 640x400" resolution. Should I be checking this?
well, if you don't they would become twice as large when playing in the game. if checked, they would be smaller for the higher res.
some people want to import some lower res sprites into a hi res project, that's probably its purpose.