As always, Iwata proves an expert interrogator, drawing neat information out of his employees. For example, New Super Mario Bros. on DS was originally conceived as a fifth game in the GBA's Super Mario Advance series. "After we released Super Mario Advance 4: Super Mario Bros. 3," says Hiroyuki Kimura, "people were asking if a '5' in the series would be released. That's right when the Nintendo DS system came out, which was perfect timing, so I thought if we're gonna make it, it should be a new title."
Additionally, Koizumi describes the experience of working with Miyamoto on Super Mario 64, which Miyamoto directed himself. While Koizumi expected written instructions, instead he got, well ... "it was just Miyamoto-san and me in the office, and he starts showing me how Mario is supposed to swim while saying, 'It's not really a breast stroke, and not a crawl, but something like this maybe...?' And he was completely sprawled out on the desk doing these swimming motions." This is the part where you laugh, perhaps nervously.