MatterBoard 3.

[Redboigoi]

How do you unlock it? Do i need 100% on board 2? And on story mode I only see half a crown. How do i get a full crown on the 1st story mode mission?

[Sp-24]

Go right on the crossroads. Or left, I don't remember anymore. In any case, just take the other path.

[Seravi Edalborez]

It'll help if, at the crossroads (I think you battle some Darkers here) you don't skip the post-battle cutscene. There should be a brief black-and-white flicker and you'll turn in a certain direction. That's the hint for the alternate path.