I can't imagine a game mechanic in Zelda that could possibly require you to use the balance board.

Are they talking about using the balance board to move? How would that even work? It's not like the old Track and Field mat.

ARGH. I trust Nintendo a lot, so if this actually is the direction they're going, I'm sure it will be play-tested forever until it is refined to where everyone will enjoy it, but it sounds like a terrible concept.

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My timeline theory:
Same sword, different day.