Super Mario Galaxy 2 is a platforming adventure game developed by Nintendo for the Wii and released in 2010. It is the sequel to the critically acclaimed Super Mario Galaxy and follows Mario as he travels through various galaxies to again rescue Princess Peach from the villain Bowser. The game features gravity-bending mechanics and introduces new power-ups, like the Cloud Flower and Rock Mushroom. The 'Nintendo Selects' edition offers the same iconic gameplay at a lower price point, making it more accessible to a wider audience.