When two of your Miis have produced a child, you can give them a special solution to instantly age them. Once they’ve reached adulthood, you’re encouraged to make them an explorer. Send them out from your port and they’ll visit other players’ islands via StreetPass, posting letters back from their travels. Explorers that visit your island will pitch a tent for an overnight stay, during which time you can spend Play Coins to buy rare products from them that you won’t find in your stores. Local play is also supported, enabling two nearby players to exchange Miis, food and clothes with each other.