The strong early sales performances of PS4 is clearly leading globally at this point but the Wii U just received what should have been a major jolt when the extremely well-received Mario Kart 8 debuted. Yet this powerhouse title was unable to give the Wii U much of a boost in Japan.The Wii U is selling just 8,300 units and the PS4 notably weak at 6,500 units in Japan. PS4 has faded so badly despite the fact that Nintendo can no longer challenge Sony in the home console market. Portable consoles seem to be doing better, with Nintendo’s 3DS selling 25,000 units a week and the PS Vita selling 13,000 units a week. Yet Japanese sales of portable consoles are down 30% from their level a year ago. What is going on ?