Blood donation is a noble act of citizenship, and its emphasis deserves wide dissemination to reach various groups in society. With technological advances, tools have emerged to support and expand initiatives striving to promote blood donation. In this context, we present Hemo4Play, an application aiming to encourage this practice through gamification. The application uses features, such as rewards and character customization, to encourage users to make regular donations, attend nearby Blood Centers and invite friends to participate. Through the evaluation with users, we receive feedback related to the usability, design and improvements.