Both H.L.A. Hart and John Searle repeatedly refer to games in their work on the concept of law and the construction of social reality respectively. We can argue that this is not a coincidence, Hart’s analysis of law as a system of primary and secondary rules bears close resemblances to Searle’s analysis of social reality as a system of regulative and constitutive rules and the comparison to games leads to interesting insights about the ontology of law and legal epistemology. The present article explores both the institutional theory of law that can be devised on the basis of the work of Hart and Searle, the method of analytical philosophy they employ and the particular consequences that can be deduced for legal research from the resulting legal theory.