They've added a way to get gems by watching ads too

Yesterday, during the Dragon Tree Merge Rush event, it was nice that they added the option to open dimensional jars with low-level items for free by watching ads.. Then they added a way to get items from the shop by watching ads, And in the world map, the chest pop-up window now lets you open chests by watching ads, and at the bottom of the pop-up window, they've added a way to get gems by watching ads. (I guess the app development company isn't making enough profit anymore lol) I thought about participating.. There was something like a quiz, but since it's an international game, it was written in English so;; I just didn't solve it. Doesn't seem like there's anything I particularly want to participate in haha I need to see a purple star to get gems, but gems are hard to come by ㅠㅠ