...Uh-oh. You guys with the WiiU version might want to be careful of this, but there's a rather harmful glitch going around with the WiiU version. Basically, some people have been gettng this error message: "There is a problem with the Sytem Memory. For help, make a note of the error code and visit
support.nintendo.com - Error 160-0103". It seems to occur when the system is turned off while playing the game, even when it isn't turned off while saving. It only affects the Smash WiiU data- everything else usually works fine. Deleting the saved data/update patch doesn't seem to fix the issue, and Formatting the console only seems to brick it. Nintendo has no idea what's been causing the problem, and have yet to make an official statement on it.
Basically, all I can say is, if you're gonna turn the game off, EXIT INTO THE WIIU MENU FIRST, THEN TURN OFF THE CONSOLE. And, under no circumstances, should you format the system if this happens to you, it will brick the console. Be careful out there, Smashers, and let us hope to Smash safely while a patch is worked on!