The box art for Super Mario Maker for 3DS has revealed that the game will not support 3D. It has previously been reported that the game will not allow sharing of courses online, nor does it have all the available tools in the original Wii U version.
It’s a very odd decision, considering Super Mario Maker would work quite well in 3D, with the backgrounds contrasting nicely against the foreground. Guessing it’s a timing issue.
Super Mario Maker will be available on 3DS on December 3rd.