Super Smash Bros. Ultimate is easily the most successful installment of this fighting series. It seems like all the factors are here to help the game to be sold well - it’s available on a very popular device, the Nintendo Switch, and the creative and quality levels have reached new standards. Financial success of SSBU was confirmed in the recent report by Nintendo. Those numbers stated 19.9 million copies sold. And now we have information from Masahiro Sakurai that the company has already sold more than 20 million copies.
Mr. Sakurai mentions this in his column #611 for Famitsu. According to the translation on Nintendo Everything, the biggest part of the text is about the recent game update 8.1 that brought to the game the new stage Small Battlefield and some improvements of online multiplayer.