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The Nintendo 3DS is a handheld console released by Nintendo. It features two screens, one, the top screen, with 3D capability, and the bottom screen, with a touch screen. It was released in Spring of 2011. The first details of the new system were revealed at the E3 Conference of 2010. Similarly to its predecessor, the Nintendo DSi, it features a camera inside the system, albeit above the top screen. The exterior has two cameras, capable of taking three-dimensional photographs. It also has a slider, which is used to raise or lower the strength of the 3D graphics. The 3D effect can be observed without the need of special glasses or headgear through the use of a parallax barrier in front of the backlight. The system also features an accelerometer and a gyroscope.
The accelerometer is used when the system is closed for a feature called "StreetPass", where the system registers steps as the player is moving. This feature is intended both to track the player's steps and to register any players who are passing by. If another player is registered through StreetPass, he or she is normally invited into the StreetPass Mii Plaza. For every 100 steps, the player can accumulate up to ten play coins each day. Play Coins can be spent in the StreetPass: Mii Plaza to purchase a random puzzle piece. They can also be spent in Find Mii and Find Mii II. Additionally, there are a number of compatible 3DS games that incorporate Play Coins into the gameplay. A similar system was previously used in the game Personal Trainer: Walking, and the Pokéwalker.
The gyroscope is used as a form of motion control in games where the player tilts the Nintendo 3DS, such as Star Fox 64 3D. Incorporated into the Nintendo 3DS is preloaded software called "Face Raiders" which has the player tilting the Nintendo 3DS to shoot faces that they took using the Nintendo 3DS Camera. A similar system was previously used in the Nintendo DSi for games such as Face Training and WarioWare: Snapped!.
The console has a "Home" button, with a similar function to that of the Wii, and a digital control slider, like the Control Stick of home consoles, while retaining the "traditional" controls of the Nintendo DS series. The system is backwards-compatible with most Nintendo DS games.
Augmented Reality Cards
Built-in software uses the DS camera to "read" AR cards, initiating game stages or 3-dimensional character animations. The cards included in the 3DS package feature the familiar ? Block from the Mario Series, Mario, Link, Kirby, Samus Aran, and Pikmin.
StreetPass: Mii Plaza
StreetPass: Mii Plaza is one of multiple software preloaded with the Nintendo 3DS. It is meant to incorporate the StreetPass feature. Other players met through StreetPass and Nintendo Network compatible games are introduced into the StreetPass: Mii Plaza. It is possible to view several attributes about players, such as their favorite title. The music will change depending on how many players the have been gathered. Included in the StreetPass: Mii Plaza are minigames known as Puzzle Swap and Find Mii (known in Europe as StreetPass Quest).
In December 2011, a system update introduced new puzzle panels, collectible hats and a sequel to the original Find Mii game, known as Find Mii II (known in Europe as StreetPass Quest II). Find Mii II is only playable after completing the original Find Mii game.
Puzzle Swap has the player exchanging 2 Play Coins for one puzzle piece, or obtaining one puzzle piece from another player met through StreetPass through the "Collect New Pieces" option. The puzzle pieces are added to panels representing a certain game or Nintendo series. The player starts with a single Puzzle Panel. It is normally impossible to unlock pieces for another puzzle panel without interacting with another player, however certain puzzle panels such as Kid Icarus: Uprising were available through promotions. It is currently impossible to unlock a puzzle piece for a puzzle panel that is exclusive to another region, such as Fire Emblem Awakening outside of Japan. 
Kirby makes a cameo in the original Find Mii minigame as one of the collectible hats. The Kirby hat can be obtained by clearing room 7 for the first time.