The worst time to prepare for war is when you find yourself in the middle of one. Tactical Decision Games (TDGs) – also called Tactical Decision Exercises (TDEs) – are, simply, situational narratives of a tactical scenario that provide leaders the opportunity to develop a plan based on abbreviated information and in a time-constrained environment. They are tactical/situational puzzles. They require little in resources and provide huge returns for decision-making and critical-thinking. TDGs are, in my opinion, an underused tool in the institutional, organizational, and self-development domains. Let’s fix that.