A game is supposed to be relaxing, I really don't get what's going on. I've upgraded every single item do why can't I pass this particular level. It's not a matter of boosters, why would I spend my time upgrading each item, training my fingers to click faster just to need a booster to pass a level. It gets frustrating after spending 4days on a particular level just cuz I can't be bother to go back to other levels to stock up diamonds for boosters.