While everybody knew that Nintendo would eventually announce a new 3D Mario title for the Wii U, many expected something along the lines of Super Mario Galaxy 3 instead of Super Mario 3D World.  Think about it for a bit though and you'll find that creating a home console sequel to the Nintendo 3DS's Super Mario 3D Land actually makes perfect sense.  Project leader Koichi Hayashida explains why in this Nintendo Developer Direct.  You'll also learn why the development team decided to make the iconic green pipes transparent, how the new cat suit power-up provides Mario and friends with new moves, and what sort of challenges the team handled when adding the multiplayer modes for up to four players.  Super Mario 3D World is undoubtedly going to do very well among Wii U owners, so one might think that Nintendo could work its magic up to a certain arbitrary point and then stop, but interviews like these really stress how the company's staff goes the extra mile to make sure as much of the game is as perfect as possible.  It's commendable in this era of "we'll patch it later" development.