The testing process is a fundamental part of the software development cycle. One of the most widely used techniques to verify the proper functioning of mobile applications is Exploratory Testing. Exploratory Testing consists of the tester freely exploring the Application Under Test through the Graphical User Interface to detect anomalies and bugs. However, such a testing methodology requires a large amount of time and has proven to be expensive and monotonous. A possible solution to mitigate the repetitiveness of human-performed activities is gamification. In recent years, several efforts have been made towards the introduction of gamification into the testing process. The goal of this paper is to provide a guide showing how to extend an existing open source Exploratory Testing tool by introducing gamification elements, to make the Exploratory Testing process more engaging and improve the testers’ performances. We give an example of a possible implementation of gamification dynamics with a progress bar that shows the tester the current testing progress. We believe that this kind of contribution can be useful and inspiring to all the researchers working in the software verification and validation field.