Any tips for 100% Streetpass Mii Plaza's Puzzle Swap?

I'll never understand why Nintendo decided to remove the Big Mushroom from the 3DS version of MM Anyone knows any glitches or something I can do to use one? Even downloading levels that have one and trying to edit them doesn't work ■m■

Looking 4 3DS Friends ☆ 1862 - 2012 - 6733