That could pose a threat to the temporary monopoly Nintendo was poised to get on portable 3-D gaming when its handheld game system launches in March.

CNN: LG unveils world's first 3-D smartphone

Nintendo has a 3-D handheld game system in the works.

FORBES: Magazine Article

The original Game Boy, in its various incarnations, is the most successful video game system ever -- handheld or otherwise.

ENGADGET: A Brief History of Handheld Video Games

The Japanese video game company reported a total of 1.2 million units sold, including both the 3DS handheld system and the Wii, which is more than we can say for any other old systems or handhelds on the market today.

FORBES: Black Friday Launch Week: Xbox 360 Sales Outnumber Wii U Nearly 2-To-1