Theorising power in student voice is contested terrain dominated by critical theory but challenged increasingly by post-structural approaches. Although critical approaches have suited the advocacy needed to establish student voice as worthy social justice work in this article I explore post-structural resources that more generatively account for the complexity, multiplicity and ambiguity of power dynamics within student voice initiatives. I examine what is opened up when power is conceptualised as "games of truth", multifarious, generative and deployed tactically by both students and researchers to co-produce "truths" that emerge as student voice. I "plug in" games of truth to data from one student voice encounter, researcher reflections and participatory research discourses to generate an assemblage of power dynamics in student voice differently. I argue that viewing power as games of truth opens up to student voice as contingent and recursive tactical contests over truth played between mutually powerful, yet differently powered players.