Sugar series challenge event
or something like that. I don't know the actual english name. Does someone else have it?
I think winning boosters is easier here than in other events since it's a battle of scores between 2 players. Though, most of the time I feel like I'm playing agaist myself or a bot since my opponent never goes to level 1 whenever I beat them whereas I have to go level 1 when I lose a round.