5 Tips and Tricks to Master Idle Island City Builder #IdleIslands #Tips #CityBuilder http://en-us-office.com/blog/5-tips-and-tricks-to-master-idle-island-city-builder/ Idle Island- City Builder is a game wherein you need to build a whole new city on your own private island. You can expand your estate business, make money, and grow your empire to become a real estate mogul. Let’s go through the best tips and tricks to help you master Idle Island City Builder.