According to the eShop description, the demo can only be played during the tournament, and it doesn't say anything about playing against CPUs. If even I was confused by the wording, then I can only imagine that the majority assumed it could be played whenever, so I expect to see lots of disappointment lel.
EDIT: There is an option to play against CPU but it doesn't work of course.
Last edited by Lonely_Dolphin - on 24 May 2018