The in-game currency gems is totally imbalance as if a child had decided the quantity which can be obtained & quantity required for upgrading restuarant & unlocking them Edit 1: someone reviews said that we should try casino but he didn't mention that for spending 10k gold you get some 150 gold which will also be spent Edit 2: spend around 20k-25k gold & you will get 15 gems, 2 gems daily & 7 gems for leveling up Edit 3: ads sucked the whole fun out of it