US sales managed to reach a bit over 700,000 copies sold after just 2 days.
http://www.destructoid.com/smash-sel...4-282672.phtml
Wii U version is rumored to have both a board game mode and stage creation mode as exclusives according to leaks from Amazon. May or may not be the two modes that were previously teased by Masahiro Sakurai.
Quote:
"Whether you're creating stages on the GamePad, competing in challenges crafted by Master Hand and Crazy Hand, or outwitting your opponents in a brand new board game mode, there's no doubt that the ultimate Smash Bros. game has arrived."
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http://www.destructoid.com/super-sma...r-282708.phtml