 These games are conducted under imperfect information, as players may not know the true state of their epistemic model. Accordingly, the relevant strategies need to be uniform. Players must say the same thing in all states they cannot distinguish. In general, then, many solution concepts produce mixed strategy outcomes. In fact, it can be shown that there exists simple announcement games without any unique equilibrium in pure strategies. However, there is a relevant role for logic to play. Suppose that the goal statements are all ‘universal’, i.e., constructed from literals by applying only conjunction, disjunction, knowledge operators, and dynamic modalities with universal announcements. Truth of such formulas is preserved when transitioning from a model to a submodel. Consequently, epistemic uncertainty becomes less harmful and knowledge games with universal goals have equilibria in pure strategies. Recently, knowledge games have been expanded further to include both questions and answers as separate actions of issue change and information change (Ågotnes, van Benthem et al. 2012).