Has anyone got all 3 star coins on every level of New Super Mario Bros. on Nintendo DS?

Question

When you get them all you unlock a different background for the touchscreen in the game. (above World 1-1)
Has anyone done it?
What does the background look like?

Answer 1

yeah...its just a Oringinal Backroudn of Mario Bros. 1

Answer 2

Get a mini mushroom and save it until the boss conflict. once you get to the boss conflict use it an defeat the bosses with the help of floor pounding them until they die. once you're approximately to bypass to the subsequent point he will fall contained in the direction of the hollow and you will finally end up on the ranges. wish this helps.