NPD sales figures coverage: The industry managed a modest increase over NPD September 2008, and generated the second best-selling September on record after 2007 when Halo 3 released and sold over 3 million copies that month. On a unit sales basis, the industry was flat. The increase in revenues is driven by a rise in average retail prices in all categories with the exception of console hardware in which the average retail price decreased 8% from last September. The best-selling platform overall remained the Nintendo DS which has topped hardware sales for 6 consecutive months.