He is currently active in the pseudo-Marxist media guerrilla group Total Refusal, a collective of artists who work with, intervene in and appropriate mainstream video games. Müllner’s work is concerned with the boundaries that gameplay establishes in digital space and their ideological background. He is interested in the possibilities of transcending these constraints, defying the rules and goals of the game, and creating a new game reality. He sees disobedience as one of the most important tools of democracy and tests its emancipatory potential within his work.