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NEW YORK (AP) - A new study says U.S. retail sales of video-game hardware, software and accessories fell 28 percent in May to $517 million. It's the sixth-consecutive month of decline.

Sales of console and portable software, the video games themselves, fell 32 percent from a year earlier to $255 million, while sales of hardware fell 39 percent to $139 million. That was offset partly by a 7 percent increase in sales of accessories, to $122 million.

Market tracker NPD Group issued the report Thursday. It tracks sales of new physical products, about 50 percent to 60 percent of the total spending. Excluded are sales of used games and rentals as well as digital and social-network spending.

The top-selling game in May was Activision Blizzard Inc.'s "Diablo III" for PCs.