It was said in the in the last Nintedo's investor meeting, that 3DS would probably make market history. And now it seems that it did, according to a poster in NeoGAF-forums.
The Nintendo 3DS became the first platform ever to have 4 different games, that sold over 2 million copies in the span of 5 months. The games that sold a couple of million or more were Youkai Watch 2, Super Smash Bros. for 3DS, Monster Hunter 4G and, Pokémon Omega Ruby/Alpha Sapphire.