Nintendo has created a special QR code to allow people to easily download the Pokémon Mystery Dungeon: Gates to Infinity – Demo Version off the Nintendo 3DS eShop. Just scan in the QR code below to setup the download of the demo.

3DS QR Code Scanning:

1. While on the HOME Menu, press the L or R Button to activate the camera.
2. Tap the QR Code icon in the lower left corner.
3. View the QR Code on the upper screen so that it is within the frame. The image must be clear and not obscured.
4. Tap "OK" to confirm the destination.
5. Tap "OK" again to launch the related application.

Source: http://www.nintendo.com/

Pokémon Mystery Dungeon: Gates to Infinity - eShop QR Code

NINTENDO DOWNLOAD HIGHLIGHTS NEW DIGITAL CONTENT FOR NINTENDO SYSTEMS - MAR. 7, 2013

Pokémon™ Mystery Dungeon: Gates to Infinity – Demo Version – Infinite Mystery Dungeons await you and your Pokémon friends on your quest to stop the forces that threaten Pokémon Paradise. You become a Pokémon and travel through a fantastic land inhabited only by other Pokémon and enlist their help as you build Pokémon Paradise. You play as Pikachu™, Snivy™, Oshawott™, Tepig™ or Axew™, and talk with other Pokémon as you explore the infinite possibilities of Mystery Dungeons that change each time you enter. You can use the Nintendo 3DS camera to discover Magnagates in the real world that lead to new Mystery Dungeons, or play with up to three other people and explore Mystery Dungeons together in Companion Mode. (Additional systems and copies of the game are required for multiplayer mode. Sold separately.)

Source: http://press.nintendo.com/articles.jsp?id=37925