This volume contains papers presented at the Poznań Reasoning Weekmulti-conference held in Poznań in September 11–15, 2018.PRW aims at bringing together experts whose research offers a broadrange of perspectives on systematic analyses of reasoningprocesses and their formal modelling. The 2018 edition consisted ofthree conferences, which addressed the following topics:(i) games in reasoning research, (ii) the interplay of logic andcognition, and (iii) refutation systems. The papers collected in thisvolume address all these topics.