"When we show a power-up to Mr. Miyamoto, we get a bit nervous. But he usually understands our ideas." - Nintendo developer Koichi Hayashida

The dev team also walked through the process of adding new power-ups to Super Mario Galaxy, Galaxy 2 and Super Mario 3D Land. We also come to learn that Miyamoto doesn't want Mario looking cute!

"We start thinking about power-ups in terms of functionality, and then we add the visual attributes. We introduced the Bee Suit and Boo Suit to add some variation to the feel and tempo of ordinary play so that players wouldn't get bored. In both cases, we wanted to add the ability to temporarily escape from the law of gravity through floatation. Since the power-ups were unique, we wanted to make the visuals also have a lasting impression. Mr. Miyamoto had an inscrutable expression when we showed him the designs; he isn't a big fan of making Mario cute (laugh)." —Yoshiaki Koizumi, producer of Super Mario 3D Land
Check out the full interview here