The dual-screen Nintendo DS has withstood the onslaught of Sony's PSP admirably, finding innovative uses for its wireless connectivity and touch-sensitive screen, so it was more than a little surprising to see Nintendo take a half-step backward with the Game Boy Micro. For a few weeks in May, gamers wondered over the tiny 4-by-2-inch device, then realized it doesn't play any of the cool new titles and quietly went back to whatever they were doing.