In this blog post, we would like to outline a game-based approach to open education (OE). For this purpose, we present a workshop concept centred around a ‘board game’: the Open Education Diamond Game, which suggests 23 reasons for OE. First, we describe the workshop concept, for which all materials are also available online under a CC licence, and then we talk to people who tell us about the background to its creation, as well as their experiences in implementing it.