Your main objective in the game should be to keep your residents happy. To increase the economy of your city, keep upgrading factories on a regular basis.
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Remember to demolish the old and unwanted factories so that there is some free space available in the city. You should build several high-end factories in your city because it will help in providing employment to your residents so that they can earn money. To earn these keys, you need to complete certain shipments or participate in contests that are held occasionally. Constructing these buildings is vital as it can help in developing your city considerably. The Golden Keys and Platinum Keys are special tokens that are required for purchasing premium buildings. So, everything is interdependent and goes hand-in-hand for progressing in the game. As you keep attracting new residents to your city, you will be able to unlock various structures. The more buildings you have, the better it is for growing your city! New Sims will be attracted to your city only if it has several varieties of buildings like residential complexes, shopping malls, recreational structures, official complexes, etc.