New Super Mario Bros. Wii

New Super Mario Bros. Wii is a side-scrolling platform video game being published and developed by Nintendo for the Wii video game console and is the sequel to New Super Mario Bros. for the Nintendo DS. The game was announced at Nintendo's press conference at Electronic Entertainment Expo 2009, and is slated for release late 2009. It will be the first game in the Super Mario Bros. series to feature simultaneous multiplayer gameplay in normal levels.

The game was created in response to Shigeru Miyamoto's desire to create the Mario series' single player gameplay for multiple players, as he was unable to bring these ideas to fruition in the previous installments. The Wii's hardware allowed him to have all the enemies and items on one screen, and allowed a camera that could focus on all players at once. The Koopalings (who originally appeared as Bowser's children in early Mario games) appear as major villains of this game.

The game uses elements of New Super Mario Bros. and also includes, for the first time in a Mario Bros. series game, simultaneous multiplayer capability of up to four players. It is played in classic style, with the Wii Remote held horizontally. Some movements such as jumping and attacks are performed with the buttons, whereas others like spinning in midair and picking up other players are performed by shaking the Wii Remote.