http://www.hori.jp/uk/Products/DS/mario ... /index.htm
If so, I suggest buying this. The 3DS is so damn small that it makes playing Mario Kart 7 very difficult and painful for extended periods of time. Holding down 3 buttons while steering just doesn't work that well with such a small, thin controller.
I spent about $20 and got this handle controller from Playasia, with the hope that it would make Mario Kart 7 playable for me. It easily surpassed my expectations.
Not only does it add some much needed bulk and ergonomics to the 3DS, it even improves the shoulder buttons. They are larger and better positioned.
It is very easy to attach and remove from the 3DS, and it stays on tight while you use it. It also doesn't block access to any of the 3DS's ports or toggle switches. Overall, Hori designed it very well, as they tend to do.
Unfortunately, it is too large to be portable, so it's pretty much for home use only.
I should mention that you don't have to use gyro controls with it. It works with slide pad steering.
Mario Kart aside, I would use this for every 3DS game. It makes everything easier to control and more comfortable.
It hasn't been announced for release in America, so if you don't want to wait, you can get one from Japan or Europe.
