When I collected a bunch of keys, click the upgrade button on the location, then it crashes. Would've been fine but when I went back in all my keys were lost and they told me I had to play for them again. Wasted my time! Had to lower my review because it keeps getting worse the farther you go into the game. You're basically forced to use boosts to play each level now! They give you a set of customers, your dishes are all maxed out, you serve everyone, and it's still not enough!