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I think he is asking if you can put a background around the game that isn't the game, like the graphics that surround Cat Astro Phi.

If that's what he is asking, it is answered a bit higher up in the post.

Yeah that was it, on the GB the buttons was not on screen (really?!? :) ) but for this & be able to play on mobile you need that or use accelerometer (could be cool)