The developers are very greedy. Of course Mytona is founded Yakutsk, Russia. You get stuck on levels for weeks sometimes months and all you get is pop ups to buy booster and rubies. It is so annoying. Lot of people leaving the game because of that and you can't barely have people to join your team. A lot of rubies to upgrade the restaurants and you barely get rewards. Every upgrade they change the way you play the game so you can't advance in the game unless you buy booster or rubies.