Game Modifications (Player Communities) "To Mod or Not to Mod - An Empirical Study on Game Modding as Customer Value Co-Creation" Katarzyna BiliĆska-Reformat, Anna Dewalska-Opitek and Magdalena Hofman-Kohlmeyer (2020) 'To Mod Or Not to Mod—An Empirical Study on Game Modding as Customer Value Co-Creation'. Sustainability, Vol. 12 (9014) 9014. In this article the authors focus on the customer value co-creation in relation to game modifications as well as the motives of mod users and creators. Qualitative research has been carried out which includes separate interviews and focus groups with mod creators and mod users. This research centres on the participation in the development of game mods and how it motivates the user and the creator based on the engagement of the individual. This article gives an in-depth definition of what game modifications are and the different type of game mods and their characteristics alongside some background historical information on the fi...