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. After the December 2011 update, additional features were introduced, including a slideshow for completed Puzzle Swap panels, a world map which shows locations that differ to the player's, an achievements list, and a music player for listening to the application's various tracks. After the summer 2013 update, a Shop menu was added, where four additional StreetPass games can be purchased. 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 StreetPassing with other people. After StreetPassing with someone, 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.

While the initial puzzles consisted of fifteen pieces, 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 StreetPassing other people who have obtained them.

Mario-themed Puzzle Swap panels

 * Mario and Bowser (15 pieces)
 * Super Mario Galaxy 2 (15 pieces)
 * New Super Mario Bros. Wii (15 pieces)
 * Super Mario 3D Land (40 pieces)
 * Mario Kart 7 (40 pieces)
 * Donkey Kong Country Returns (24 pieces)
 * Mario Tennis Open (40 pieces)
 * New Super Mario Bros. 2 (40 pieces)
 * Luigi's Mansion: Dark Moon (40 pieces)
 * Nintendo Starlets (features Peach, Pauline, Rosalina, Zelda, and Toon Zelda) (40 Pieces)
 * New Super Mario Bros. U + New Super Luigi U (40 pieces)
 * Mario & Luigi: Dream Team (40 pieces)
 * Super Mario 3D World (40 pieces)
 * Yoshi's New Island (40 pieces)
 * Captain Toad: Treasure Tracker (40 pieces)
 * Ultimate NES Remix (40 pieces)
 * Super Smash Bros. for Nintendo 3DS / Wii U (40 pieces)
 * Mario & Luigi: Paper Jam (15 pieces)

Flower Town
Flower Town (known as StreetPass Garden in PAL regions) is the second of the four games that was added to StreetPass Mii Plaza in 2013. The goal is to grow 80 different species of flowers. Each Mii that visits the player's garden, either makes the current flower grow or pollinates one of its seeds. The player can decorate their garden with flowers and accessories. Players are also able to change the pots that their plants are in. Some Mario-themed pots are the Green Pipe, Yellow Pipe, and Brick Planter. The Mega Mushroom Flower resembles a Super Mushroom, and the Bite Weed is similar to a Piranha Plant.

Ultimate Angler
Ultimate Angler (known as StreetPass Fishing outside of America), is a fishing game released in 2015 as the Bundle 2 DLC games with the second being Battleground Z. Players get bait from people met via StreetPass, the type of bait depends on what their favorite color is. There are two species of fish that relate to the Mario series that are considered mystery species that only specific Mii characters met can spot them, and they are the Cheep Cheep and the Blooper. The Cheep Cheep can be found on Oceanora Island and the Blooper can be found on Mythroll Island.

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.

Find Mii

 * Mario's Cap
 * Luigi's Cap
 * Toad Hat
 * Bowser Hat

Find Mii II

 * Peach's Crown
 * Yoshi Hat
 * Wario's Cap
 * Boo Hat
 * Shy Guy Mask
 * Donkey Kong Hat