StreetPass Mii Plaza

StreetPass Mii Plaza is a pre-installed application on the Nintendo 3DS developed by Nintendo that relies heavily on StreetPass connectivity to play its games. It allows players to create a profile using any Mii that they have made in the Mii Maker, which will be sent to other users via StreetPass when connected, and used to play games. Two games (seven after updating the software completely) which utilize the player's Mii can be played in the Plaza: Puzzle Swap, Find Mii, Mii Force, Flower Town, Warrior's Way and Monster Manor. The game's only unlockables are Nintendo-themed accessories which can be used to dress up the player's Mii, and three dimensional scenes featuring recent Nintendo games or events.

Features
StreetPass Mii Plaza allows the creation of a profile that players can customize with their personal information, which is sent to other users upon connecting via StreetPass. This information includes a Mii, which is used as a player character while in the Plaza, a greeting, a birthday, the 3DS' registered location and minor details such as a favorite hobby or dream. Players can choose to make some of this information private if they wish, and can change the information in the Settings sub-menu at any time. As long as the player has the wireless communications switch turned on and StreetPass enabled, the data is transferred between any wireless-enabled 3DS system within range. A notification light on the 3DS turns green to indicate when another 3DS has been detected, even when the software is closed.

StreetPass Plaza is the location where the player's Mii resides. The Plaza is lush with green lawn and small plants, and features a yellow arch adorned with a grass root as its front entrance. Upon opening the software after a connection has been made, the entrance is shown with the player's Mii greeting any new Miis that have been encountered, before inviting each to take residence in the plaza and play Find Mii and Puzzle Swap with them, as well as any additional games that they have purchased. As Miis are invited into the Plaza via StreetPass and online games such as Mario Kart 7 or Mario Tennis Open, the Plaza grows, and the music becomes more dynamic.

The player is given the option of playing StreetPass games to unlock accessories for their Mii and 3D images related to various Nintendo series by using either Miis obtained by StreetPass or Play Coins. In December 2011, StreetPass Mii Plaza received an update, which introduced additional features including a slideshow for completed Puzzle Swap panels, a world map that shows locations that differ to the players, an achievements list, and a music player for listening to the application's various tracks. In summer 2013, StreetPass Mii Plaza received another update that added a Shop menu, from which the player can purchase four additional StreetPass games: Mii Force, Flower Town, Warrior's Way, and Monster Manor. The touch screen was also updated to allow for quick access to each of these games, as well as Find Mii and Puzzle Swap. Other features such as an Exchange Booth for unlocking outfits and a Check for Updates tool were also introduced.

Puzzle Swap
Puzzle Swap features various different puzzles that the player can complete. Players are given one piece to start off with, and more can be obtained by tagging other people via StreetPass. After doing so, the player is then entitled to take a puzzle piece from them (and vice versa) to add to their collection. If another player does not have any new pieces, nothing is gained. Players can also spend two Play Coins to buy a random puzzle piece to any incomplete puzzle they have. Once a puzzle is completed, a three-dimensional image of the puzzle can then be viewed.

The initial puzzles consist of fifteen pieces, although the December 2011 update included several puzzles with either twenty-four or forty pieces, as well as the ability to receive new puzzles through SpotPass. Additionally, the four center-most pieces in the twenty-four piece puzzles and the eight center-most pieces in the forty piece puzzles are pink. These pink pieces cannot be purchased with Play Coins, and can only be obtained by tagging other people who have obtained them.

Find Mii
Find Mii is a basic turn-based RPG where Miis are utilized to fight through several enemy-filled rooms in order to free the player's own Mii from imprisonment. The minigame inspired a stage of the same name to be included in Super Smash Bros. for Nintendo 3DS.

Miis are given two attacks, either a three-hit sword attack or a magic attack with effects determined by the Mii's favorite color, and are leveled up by consecutive StreetPasses with the same person. Players can also hire 'wandering' heroes (taking the appearance of either a cat or dog depending on the player's preference) for two Play Coins, with a limit of up to ten in a single party. Accessories such as Mario character caps can be obtained after clearing certain rooms and are used to dress up the player's Mii in the Plaza.

An expansive sequel to Find Mii, known as Find Mii II, was made available with the December 2011 system update, featuring tougher challenges, additional options (such as the ability to purchase potions with Play Coins) and new unlockable accessories. It can only be played once the first Find Mii game has been cleared twice.

Paid games (DLC)
The option to purchase 4 additional StreetPass games became available after updating the software. These games could be purchased individually, or all at once for a discount. StreetPass tagging players who have also purchased one of these titles allowed for additional, individualized bonuses to be obtained within the games they share. The DLCs are no longer available as of the eShop closure on March 27, 2023.

Rabbit
There is a rabbit that appears in rabbit-holes in Games mode for the two bundles of Premium content introduced with StreetPass Mii Plaza's updates. The rabbit offers info on each game to try and sell the player on purchasing them. She also offers the game's Upgrade, shown when starting-up. There is also a Bunny Speech Bubble available for the the player's greeting; it is pink and has carrots and rabbit footprints. A wandering, bunny hero can be summoned in the Find Mii game, and the Bunny Ears item is based on it. She is simply referred to as "the rabbit" in most texts, although her name is written as "Salesbunny" in the title of her theme-song, accessible in the Music Player. The rabbit appears as the golden, trophy icon for the Game Vault mode on the main menu.

Outfits
Hats and Costumes (collectively referred to as Outfits) are used to customize the player's Mii in the Plaza. Players can choose a favorite outfit for their Mii to wear while playing StreetPass games, and this outfit will also be worn when the player's Mii is transferred to other Plazas via StreetPass. Full costumes and various other hats can also be obtained by exchanging tickets earned in Mii Force, Flower Town, Warrior's Way and Monster Manor at the Exchange Booth.