Something I found out by making a map.
I was happily making a map anyways, and I came up with making MEGA background by scaling it. I realised if you make the background to big, it'll mess all the level up (it looks as if there was no background, just a little deferent) I recomend you try this, it's a little hard to explain. Just make a big background sprite and go to the edges. See? Kinda anoying, since it would be easier if you could have just one big background.