As I am kind of stuck with backgrounds and how to put them, I have to decide something:

As it is a platoform game, I have two possibilities for scrolling and movement.

The first one is like you do in Megaman (or Rockman if you like the japanese version) where you have to walk from the beggining to the end of the screen to have a new one appearing.

The second one is the way games like Ghost And Goblins work. It seems like you are moving but you are always in the middle of the screen and the background is what moves.

I need to decide...