Golden Sun Universe
Super Smash Bros. for Wii U is a Nintendo fighting game released on November 21st, 2014 for the Wii U console, and serves as the fourth installment in the Super Smash Bros. franchise. It features over 50 Nintendo characters from various Nintendo-owned properties, as well as several third-party characters.

Content from Super Smash Bros. Brawl[]

There is a much smaller amount of Golden Sun content in Super Smash Bros. for Wii U when compared to Super Smash Bros. Brawl. The assist trophy for Isaac that was present in Brawl has been removed, as has its companion trophy. The reason for the removal of the assist trophy and its companion trophy are unknown and have not been officially commented on by any member of the Golden Sun or Super Smash Bros. development teams. There is no evidence from data mining that these pieces of content were ever intended to be present in the game.
The only Golden Sun content that is retained from Brawl is the "Battle Scene / Final Boss" music track, which was remixed for Brawl from songs present in Golden Sun: The Lost Age. As in Brawl, this song plays on the Norfair stage from the Metroid series. In addition to this song, a track titled "Weyard", ripped directly from Golden Sun: Dark Dawn, is also present. This song plays on the Palutena's Temple stage from the Kid Icarus series.