It might be easier now since you can hire old allies and you can pick your strongest allies or pick the correct shirts to get through certain rooms. Not sure when Nintendo added that to Find Mii I, but that's pretty much the only way I've been able to get through Find Mii II. Relying on Streetpasses while living in the suburbs is an exercise in frustration and loneliness. Also, this will undoubtedly become easier once I get my XL and give my brother my regular 3DS. A StreetPass every time I do laundry at my mom's house. Success!