"Wii Music completes what Miyamoto wrote in his proposal when he came up with the idea for the Wii," Iwata told the Wall Street Journal. "He was saying that he needs to think up more ideas now."

Miyamoto's design scheme was presented at this year's Game Developer's Conference by Nintendo director Takao Sawano, who unveiled a conceptual diagram created by the designer as part of his proposal for the Wii console. The diagram showed numerous references to Wii Sports, Wii Fit and Wii Play.

Wii Music was also a part of this early design phase, and was one of the first titles demonstrated on the system, debuting at the 2005 Tokyo Game Show.

Iwata further noted that most of the accessories initially planned for the console—including the Wii Zapper and Wii Wheel— have been released, and the company currently does not have plans to release "a whole lot more."

Regarding the recently unveiled Wii MotionPlus peripheral, the executive stressed that Nintendo would aim to keep costs low.

"There will be games that will be enhanced by the Wii Motion Plus as well as games that can only be played with it," he stated. "Users will need four if they have four controllers, but we're going to try to offer it for as little as possible. We haven't announced the price yet, but the cost of making the Wii Motion Plus is not that much, so I think we can make it very affordable.