I read of few of those Iwata asks interviews, and as a huge Nintendo fan, I found them extremely interesting and informative. Did you know, for example, that the only reason there were 2 quests in the original Legend of Zelda was because of a mistake made by Takashi Tekuza in which he only coded half of the original plans for each dungeon? I also learned a few tricks that were used to save space in Super Mario Bros. I can't believe I never realized that shrinking and going down a pipe produced the same sound effect, just like jumping on a koopa and swimming do. There are lots of photos of "ancient" documents such as sketches, brainstorming sheets, and control layouts that were created as early as 1985 for Zelda and Mario. I find it all fascinating- how these people sit around a table and talk about originally creating a couple of beloved franchises in such an informal and unscripted way.