Trying to open the Dimensional Cache..

Slurp! The Dimensional Chest appears randomly when you merge high-level items at camp. Try merging items or buildings of level 5 or higher and examine them carefully. You can open it by watching an ad or using gems, so make a wise decision, hmm!

When you merge things, sometimes a dimensional jar wrapped in a transparent shield appears like a bonus. That's what I'm talking about. In the past, you had to open it with gems, but nowadays, in some cases, they let you open it for free by watching an ad. Try merging various items.