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First official Mario expansion pack

First official Mario expansion pack
Who
New Super Luigi U (Nintendo, 2013)
What
First
Where
Not Applicable
When
19 June 2013
Compared to Sony and Microsoft, Nintendo have been slow to adopt practices such as online multiplayer modes, expansion packs and downloadable content (DLC). However, the release of New Super Luigi U (Nintendo, 2013) marks the first time an official expansion pack has ever been available for a Mario videogame. Players will control the famous plumber’s leaner brother who can jump higher but takes longer to stop, offering new challenges in familiar worlds.