Not my favourite
Duel Studio: On this screen you can watch replays of other duels, or head into the building to edit your decks, view the list of all the cards that have been implemented into the game (most of them transfer to Speed Duels quite well, but several cards just couldnt be transferred and on the contrary, a lot of cards were created specifically for Duel Links), view your Chronicle Cards (special cards whose duel stats you want to keep track of, for some reason), the list of all the Skills in the game (and which duelist uses which), view which cards are the most popular at the moment, view decklists, see all of the card summon animations youve unlocked, and even view scenes from past events
This can easily lead to a turn three, or earlier, win, if you so desire
It was previously called the removed from game zone, which does make clear what its meant to be used for
If you can activate the effects of the [Sanmyojin], you'll be sure to get the upper hand