Game Development Documents
Concept Art
Design Documents
Technical Documents
Sources
Super Mario Bros. 30th Anniversary Special Interview. September 13, 2015.
Asashi Shimbun. 大事にしたのは「感覚」 スーパーマリオ、開発者に聞く. September 12, 2015.
Iwata Asks, Bonus 1: Ancient Documents from 1985. December 3, 2009.