New Super Mario Bros. Wii for WiiOn: Wii
Now players can navigate the side-scrolling worlds alone as before or invite up to three others to join them at the same time on the same level at any point in the game for competitive and cooperative multiplayer fun.
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Nintendo also releasing Kirby collection on Wii, and updating Mario Kart 7 in May.
There's certainly a time and a place for playing with yourself, but as a general rule of thumb it's always more fun to play with somebody else.