If you've got a 3DS, and you've got an Internet connection, there's no reason to not have downloaded the latest system update and pulled down 3D Classics: Excitebike from the Nintendo eShop. It's free, after all.
But developer Arika didn't just break down the 2D game into separate layers for 3D presentation. As you can see in the video, activating 3D mode tilts the camera angle, giving you a never-before-seen look into the distance of the stadium surrounding Excitebike. (I'd like to think this was always there, we just couldn't see it, but of course that's not true.)
Some of the course features acquire more detail with the depth. It felt a little bit more difficult to play the game in this mode, for some reason, although I just as quickly got the hang of it as I did playing the old 2D version with gamepad controls for the first time in 15 years.