Talk:Winter 2018 Event/@comment-30383484-20180312094351/@comment-24930367-20180312095613

In "Easy" (before I dropped down a difficulty) I unlocked the shortcut by S-ranking everything until node H (going with fast-speed Surface Force, choose K from J).

Then I just proceed normally with Mobile Force to the boss. Once D was S-ranked, the B -> D opened up.