Here's Kingdom Hearts 3D:
http://www.khinsider.com/news/Nomura-Interview-in-Nintendo-Power-2285
It was because of 3D.
As I said they all where, and that might even include Monster Hunter 3G & 4 which where both being made in 2010 like Resident Evil: Mercenaries 3D & Mega Man Legends 3 (canceled, unless that new Mega Man game they mentioned turns out to be this uncancel, since the prequel was finish and the retail game was already 29% developed) & Resident Evil: Revelations & Super Street Fighter 4 3D edition & Tales of the Abyss 3D & etc.
I never said every 3DS is because of 3D, but so many of the good ones where. And even the guarantee ones like Mario Kart 7 & Pokémon X & Y wouldn't have such great new gameplay mechanics without 3D to inspire them to really come up with some cool ideas since its being played in 3D.
