New Super Mario Bros. U + New Super Luigi U is a compilation of New Super Mario Bros. U and its expansion, New Super Luigi U that was originally bundled with the Deluxe Wii U Set, starting in November 2013 in North America, Europe, Australia and Brazil. In October 2015, the title was available on its own at retail and the eShop in North America, replacing the original.
The main difference is that the title includes 222 bonus videos. The New Super Mario Bros. U videos can be found on Nintendo's Youtube channel while the New Super Luigi U videos are exclusive to the compilation. Additionally, the original New Super Mario Bros. U title screen and game disc have been altered to accompany the included expansion.