I noticed that when I play DS games on my 3DS, the games don't fill the entirety of the top screen on the 3DS – there are black bars on either side of the image.
Is there a way to get the game to fill the entire screen? Or is that just going to make things look terrible?
Best Answer
There appears to be two modes for playing DS games on the 3DS. If you hold Select+Start while the DS game is loading, it will display in it's "Native Resolution" on the 3DS screens.
Unfortunately, this is going to make the black bars bigger and not smaller. As far as I can tell, this is the only other display mode that the 3DS supports when playing DS games.
It has to do with the different resolutions/aspect ratios of the DS and the 3DS. Similar things happened when playing GB games on the GBA.