New Super Mario Bros. U + New Super Luigi U
From the Super Mario Wiki
New Super Mario Bros. U + New Super Luigi U (alternatively written New Super Mario Bros. U and New Super Luigi U) is a compilation title for the Wii U console. It is the first compilation of Mario games on the Wii U and includes New Super Mario Bros. U and New Super Luigi U on a single disc. It was released on November 1st, 2013 in North America, November 7th in Europe, November 8th in Australia, and November 26th in Brazil.
At first, it was only available with the Mario & Luigi Deluxe Wii U Set (known as the Premium Pack in PAL regions), but it saw an individual release in North America on October 16, 2015. This compilation title can be purchased at retail stores, or at the Nintendo eShop. If purchased digitally, the compilation title requires 14.2 GB to be downloaded. As a result, certain Wii U models are not able to download this software without an external storage device.
Unlike the retail version of New Super Mario Bros. U, copies of the game included in the Wii U Deluxe Set do not include an instruction booklet or a Club Nintendo code, because in this case, New Super Mario Bros. U and New Super Luigi U have separate codes.
Differences from the original games