GenGame reported on Tuesday that a source within Retro says that Nintendo has tasked the company with building multiple engines for Wii U to aid both first and third party developers in making games for the unusual tablet controller console. This makes sense in light of Nintendo's past comments about developing HD games in house. "I think that we will have to rely on outside companies for graphics and other elements that require massive resources," Zelda producer Eiji Aonuma said earlier this year.