The levels of the first restaurant can be all three-starred without maxing out all the equipment and food. However, some upgrades require gems. At first it doesn't seem like a big deal, and at first it is easy to gain some gems by leveling up. Upon purchasing another restaurant, the true nature of the game is shown. Most upgrades require gems, which are increasingly difficult to earn because leveling up requires more experience. The levels are impossible to complete without buying these upgrades