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You'll see this when Sonic Advance and Mario Advance 2(Super mario world) come out. Look exactly the same as what you saw on the SNES/Megadrive.
GBA does have its problems though, the main point being the quality of the screen. Its not perfect, and some games can be hard to see. But its only with a few games, only really Tony hawks is "dark" from my experience anyway. Mario Kart is a wicked current example of how the Gameboy has advanced.
GBA = 32 bit
GBA 'looks worse' becasue it has to run the games in a smaller space and on an LCD screen (I think)
All you have to do is compare the two Monsters Inc games, that'll show you the difference in the graphics.
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