Home News Super Mario Galaxy 2 Mario Galaxy 2 announced at Nintendo's E3 conference News by Stephany Nunneley-Jackson News Editor Published on June 2, 2009 Follow Super Mario Galaxy 2 Nintendo announced Mario Galaxy 2 For Wii at its press event at E3. Riding Yoshi. On very Galaxy-like levels. Spherical worlds and stuff. Giant Goombas too. This is the first time a second 3D Mario game has ever appeared on a single Nintendo console.