This document discusses how playing and building historical games can teach us about the past in three ways. First, playing games engages us emotionally with history and encourages exploration of contingency. Second, building games forces us to explicitly state our assumptions about how the past worked. Third, agent-based modeling allows us to simulate systems and explore unintended consequences of different scenarios, providing a "personal Groundhog Day" for history. The document argues that toying with history through games and simulations can foster deeper engagement and understanding compared to more traditional forms of learning history.