It's fun!

Hmph, collecting that many gems, you're pretty good, nya! With that much passion, the Gem Collector of the Arida Desert would be reassured, nya nya. I'm not exactly praising you, but... please keep collecting lots of gems, nya! Hmph nya!

The previous hidden boss in this game isn't showing up for me. Seeing others get it, the hidden boss seems to be a big meal and not too hard to clear. I think this kind of thing is the best, better than the merge hidden.

Oh, really? 🤔 I'll try it later 👍👍

I've 100% completed the hidden content in this game, and it's not that difficult. For blue cards, just upgrade them to level 5 early on, and you can keep using the purple ones. There's a 150% combat power hidden challenge, but upgrading your cards will be enough, so save up your money.