New Super Mario Bros. Wii is a side-scrolling 2.5D Mario platformer for the Wii and the tenth game in the Super Mario series. In addition to the single-player experience, New Super Mario Bros. Wii also features a multiplayer mode for up to four players. This is the first Super Mario game to feature co-op and vs. modes at the same time since Mario Bros. It features more items, new levels, and more enemies than the DS predecessor. The game introduces two new power-ups, the Propeller Mushroom and the Penguin Suit, which turn characters into their propeller and penguin forms, respectively.

Today is Princess Peach’s birthday, so her castle is full of presents. Mario and Luigi are there, and they’re celebrating with the Toads and Princess Peach when a huge birthday cake arrives. Who in the world could it be from?

Suddenly, Bowser Jr. and minions jump out of the cake. Everyone is shocked and pandemonium ensues. In a flash, the invaders snatch Princess Peach and fly away in a giant Airship.

The Toads are in a panic! Mario and Luigi—and Yellow Toad, Blue Toad and Yoshi too!—pursue the Airship in order to rescue Princess Peach.

Together, the four head out on an adventurous journey!