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how do i open it? this is my first game i tried. I can't seem to find it in the 3dnes

Suppose that you already have the mario3.nes file.

Download the 3dn file

Put it in the same folder with the mario3.nes file and rename it to mario3.3dn

Launch 3dnes, open the rom mario3.nes and enjoy.

So you out the original .nes rom in the same folder as the .3dn file both with the same name but different extention and open the .nes and it should launch? Its not working for me if this is correct.