E3 2012: Behind the Scenes of New Super Mario Bros. 2

From an interview over at IGN


IGN: One of the things I wanted to ask about was the cooperative mode and how that's implemented. Are both players on the same screen? Are they able to explore on their own? And did that impact at all how you design the game...?
Tezuka: We looked at multiplayer on Wii. Multiple players, for example two, on the same screen who are able to see each other, that's fun. We actually ran some experiments when we were working on Mario for DS and saying, what would be fun for a two-player experience on the Nintendo DS?