April 2008 NPD sales data results. Coverage: April 6 to May 3 (data released May 15) April saw the release of two much-anticipated blockbuster releases in Grand Theft Auto IV for the PS3/Xbox 360 and Mario Kart Wii for Nintendo's system. Although only available for 5 days for April's NPD, GTA4 recorded sales of 1.8 million for Xbox 360 and 1.0 million for the PS3 for a total of 2.8 million units and a 1.8:1 ratio in favor of the Xbox 360. Mario Kart Wii came split the two versions by coming in at #2 with 1.12 units sold.