How to Play Augmented Reality Games on Your Nintendo 3DS with Android & WP7 Phones
The Nintendo 3DS comes with six AR cards that allow you to play the augmented reality games packaged with the device. Of course, if you were to lose the fragile paper cards or damage them in some way, you would be unable to continue playing them. It's easier and safer to carry constant access to the AR games by installing apps on your Android and Windows Phone 7 smartphones. Both apps are free and available through the smartphone app markets.