Announced earlier last week in Famitsu was the new circle pad attachment for the Nintendo 3DS, which is said to be made just for the recently announced Monster Hunter 3G. However, Nintendo have revealed tonight that more third party games will support the attachment as well, including Metal Gear Solid 3D: Snake Eater and Kingdom Hearts 3D: Dream Drop Distance.
The list of titles remain tentative, but other titles include Ace Combat 3D: Cross Rumble, Dynasty Warriors Vs. and Resident Evil: Revelations. In addition, Nintendo revealed that the attachment will retail for 1,500 yen (approximately $20) and will require a AAA battery to operate.
While the mentioned games will offer support for the extension, it appears that it will not be a mandatory requirement to actually play the games.