According to NPD Group, total U.S. sales of video game hardware, software and accessories rose 23 percent in the first quarter of 2005 to more than $2.2 billion The sharp increase was mainly due to the launch of PSP and NDS handhelds, and software wise the best selling product was Sony's PS2 title Gran Turismo 4, with 1.1 million copies sold. The $10 billion U.S. video game industry is keeps steady in comparison with the domestic movie box office sales.