It's a testament to the ongoing evolution of the Mario franchise that a return to its humble 2-D sidescroller origins seems almost revolutionary. Two years ago Mario went on a cosmic trek to warp gravity and bend minds one weird constellation at a time. Perhaps he fell into a wormhole in 2007, because his subsequent outing feels distinctly 1992. In fact, smudge the graphics and compress the delightfully silly voice work and you might be able to convince yourself that it's really Super Mario World: The Lost Levels. And isn't that what you've been waiting for all along?