A 3D platformer game developed and published by Nintendo for the Wii - a sequel to Super Mario Galaxy.
Similar in design to Super Mario Galaxy, Super Mario Galaxy 2 is the fourth 3D platformer in the Mario series. It was released in May 2010.
The game follows Mario in his quest to save Princess Peach from Bowser. Bowser has taken her prisoner, and also has taken control over the universe using Power Stars. Each world consists of a galaxy made up of several planets, and at each planet you can earn at least one (often more) Power Star.
The main aim of the game is to collect Power Stars, which are earned by completing missions on the different planets in the game.
This game also features the "Cosmic Guide", which appears if the player fails a number of times in a level, and allows the player to give the computer control over Mario in order to finish the level.