here are some tips on the streetpass mansion game (ignore this comment if you don’t want small spoilers): the game doesn’t end at floor 20. to get all the plaza tickets you’ll need to get silver and gold treasure boxes, so don’t obsess about filling in a floor (which doesn’t earn you any bonuses). it’s much more important to get as big a block of a single color as possible. also, as you may have noticed, you’ll get better treasure boxes the more squares you fill in at the same time with a single piece.