You can participate in a brief survey and pick up a Google Play gift card by downloading the Google Umfrage-App
There is no hassle when it comes to getting started. You will be prompted to answer a few questions about yourself once you have downloaded the application. A survey is then sent to you approximately once a week. It is however possible for the degree of difficulty to vary. An SMS notification will be sent to your smartphone as soon as a brief, relevant survey is available for you. If you participate in the survey, you could receive a Google Play voucher worth up to $0.80. Among the questions are: "Which logo do you think is best?", "What type of advertising do you think is most appealing?", or "Where would you like to travel next?".