Do you need to unlock StreetPass features somehow before you can swap data with players? I made a ProfiCard and got three people in my Mii Plaza who were playing the game, but haven't found anything unlocked from them.
Also, I really recommend playing with the hitsounds off if you haven't tried it already. Those chimes are kind of distracting compared to EBA and Ouendan.
Also, I really recommend playing with the hitsounds off if you haven't tried it already. Those chimes are kind of distracting compared to EBA and Ouendan.