Barozi on 09 February 2014
It's certainly not the biggest as stated by the article but much more than NSMBU.
http://www.nintendonerds.com/guides/wii-u/wii-u-eshop-games-list-download-sizes-retail
However size isn't everything. Uncompressed audio files alone could fill 5GB or so.
Most games up there fit on one 360 disc (7.9 GB usable space) for example.
