One of the best ways to buy any kind of Play Store content for free is to use the Google Opinion Rewards app, a mobile survey tool that rewards you with cash in your Google account every time you complete a few brief questions.

On installing Google Opinion Rewards, you will receive an introduction about the app which you can skip up move to next step.

The app will ask you to provide some information about yourself. The reason behind this is to receive your demographics information which will be related to the surveys. This includes your age group, postal code, gender, language, etc.

Meanwhile, by answering these questions, you are creating a profile of yourself. Google Opinion Rewards will ask whether you want to receive occasional surveys so you can choose from the options After your profile is created you’ll be taken towards the app dashboard where you can view your Google Play credit and reward history. When any survey is available, you’ll be sent a notification about it which you can view in the Google Opinion Rewards dashboard.