The House of Mario is celebrating Luigi's 30th anniversary by releasing several titles focusing on Mario's twin brother. The New Super Luigi U DLC will rework existing levels in New Super Mario Brothers Wii U to deliver new experiences where players will control only Luigi. Nintendo president Satoru Iwata said that work on the DLC is akin to that done for a full game. The DLC will be available later this year via the Wii U eShop.
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Ugh. Nothing is sacred when even Nintendo games can have DLC.