New Super Luigi U will be released both as a downloadable add-on for New Super Mario Bros. and as a special standalone version that will be available at retail. The retail version will not require a copy of New Super Mario Bros. U to play.
The retail version will cost $30 while the downloadable add-on version will cost $20. Multiplayer will be enabled in the game and will make Nabbit a playable character.
New Super Luigi U will be released on June 20th in North America and Europe. The standalone packaged version will be released on August 25th in North America and July 27th in Europe.