Bigger than that (and there are two of them of course).
As I said the mircro is designed for people who game on mobiles and want a similiar sized handheld device. Both the DS and the PSP require a large pocket.
For anyone who has played a game on a phone, the screen size isnt really an issue.
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Sure, not for a game like Tetris, or Poker. But what about playing games like NBA Live, in 3D in an inch and a half phone screen?