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My favorite background is the Underground. It's like going through a pirate adventure.

I think I like the Space background. Mainly because of the stars and the huge planet in the background.
All right,I think I have a few. Space,Underground,Volcano,Hills And Ocean,Sky(because it's the only moving background ),Desert And Hills and Snow.

Well done, you just made a 1 and 2/3 year bump.