Best Of

Hi @dianakotori it’s still in the testing phase, so it might come to your game later.
It’s a sticker collection that gives you rewards and gold bars once completed.
Take a look at my screen:

There are currently two "albums": one is "Rancid" and one is "ChooChoo".

Stickers for these albums can be found in the daily rewards (occasionally, not every day) or upon completing events (such as quests).

The event ends for me in two days; when it started, I had a week to complete it.
I suspect a similar or identical event will follow, though I don't know for sure. It seems I am in a test group for this event along with a few other players.