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"We wanted a co-op mode that would make good use of the Nintendo Switch controllers since it comes with two of them," said Kenta Motokura, Super Mario Odyssey's director. To get past a roadblock, Motokura helped in separating the two Joycons, before handing one off to a Treehouse representative to aid him in his quest.
The co-op mode has the other player controlling Cappy, Mario's signature hat. Cappy doesn't have the same controls as Mario—Cappy's invincible, and flies forward only to return to Mario like a boomerang. On Treehouse, they used the other player controlling Cappy as a way to reach a potential out of reach item. As Mario dashed across the deserts sands, the player-controlled Cappy spun around Mario, acting as a sort-of light barrier to protect the plumber as he runs.
Co-op won't be required to enjoy a lot of what Super Mario Odyssey has to offer, but will be incredibly useful in the face of certain puzzles. Like a timed one, as exemplified on the stream. Super Mario Odyssey will be released on the Nintendo Switch on October 27 this year.