RedEaredSlider writes with news that Nintendo is working on a Super Mario Bros. title for their 3DS handheld, bringing the classic franchise into the world of 3-D. The announcement came at the end of a lengthy conversation about the creation of the original Super Mario Bros. for the NES with four of the game's developers. They talk about various ideas that didn't make it into the game and show off some interesting conceptual drawings that evolved into one of the most recognizable games of all time.