Recommendation ITU-T P.809 presents guidelines for conducting subjective experiments for the quality of experience (QoE) assessment of gaming services. First, an overview about gaming QoE features covering hedonic and pragmatic quality as well as player experience is given. Additionally, methods for two test paradigms, passive viewing-and-listening tests and interactive tests, are described including information about the test environment and test set-up, participant instructions, selection of game materials and a list of available questionnaires for the assessment of several gaming QoE features such as flow and immersion.