What is this?

That's right~ Duplicate stickers are useless, so you can exchange them~ The rewards are 250, 450, and 700, which are all different, so you can collect them and use them.

Do I need to collect 250 of the duplicate items?

Yeah~ If you're going to do it, it's more beneficial to collect 700 and do it when the buff that gives more cards appears.

Don't use them now, trade your duplicate cards for the ones you don't have first. You'll lose out if you trade now.

Thanks