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a.l.e.x00 said:
Many of the numbers in that list are incorrect. The Playstation Portable, sold far more than just over 20 million units. Why would they group the Gameboy, and Gameboy Color? They are two separate portable consoles.

 Didn't the Gameboy and Gameboy color use pretty much the same cartridges? They certainly looked the same.. that's the reason why the GBA wasn't grouped with them. Its were different.