Tried multiple times again but still couldn’t get in
While this could be another problem i tested it is most likely that they have every feature but display courses on 3ds marked green on the progress so maybe wait for it to be marked green and try again
this seems to be a reoccurring issue… close as it cant be fixed.
I know that the 100 Mario Challenge isn’t supported yet, if that’s not what you were attempting to play, it may be that the servers for pretendo’s SMM are down
@Daniel9698
Unfortunately, with 006-0112 in SMM 3DS, this is an error some people just get and we don’t know why yet.
Unknown cause, unknown fix.
I wish we could help more, but until we know more all we can recommend is keep trying every now and then. 
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