In a Q&A with investors, Nintendo’s Shigeru Miyamoto admitted that Nintendo struggled in adapting to HD development for the Wii U as it requires twice as man manpower to do so.

“When it comes to the scale of software development, Wii U with HD graphics requires about twice the human resources than before,” Miyamoto explained.

Miyamoto says Nintendo may have “underestimated the scale of this change” and as a result, the overall software development took more than originally anticipated, reports Joystiq.

However he did say Nintendo, “are almost out of this phase,” and are also, “trying to create something unique utilizing an easier development approach,” in what is dubbed ‘Nintendo Web Framework’.

The Nintendo Web Framework allows developers to use HTML 5, JavaScript and CSS to create Wii U apps.