I think I may be completing Find Mii 2 Secret Quest soon since there seems to be no more keys and chests to find. If I continue to play regular Find Mii 2 will I continue to find new hats--or have I totally finished Find Mii 2? Actually there may be a hat or two that I don't have yet (I'll have to check), but is there an actual end to finding hats in Find Mii 2?
At the moment I don't have any of the other street pass games. In those games do you just earn tickets to buy new hats and items? Can you also win new hats within the games?
ACNL, Tomodachi Life, Find Mii II, and Mario's Picross
I play flower town. You do receive tickets fairly often, I have gotten maybe 10 and have been playing for a few months. It is a slower game but if you like flowers than it is great. There is only one new hat you get that I know of and it is a flower bonnet (I do not care for it). Otherwise I haven't gotten any game specific hats for it.
Animal Crossing New Horizons, Mario Kart, Legend of Zelda (various)
You will receive one bonus hat for purchasing a game, and a second for completing the game, meaning there are 12 hats that can be obtained only by purchasing these StreetPass Mii Plaza games. Each of the six games will offer you an assortment of Plaza Tickets, as well as the Mii V.I.P. section that you can purchase. Those Plaza Tickets can then be traded in at the Exchange Booth for a number of hats, costumes, and speech bubbles that you cannot obtain through any other means.