A new simulation called The Evolution of Trust does a good job of introducing the basic concepts of game theory.
As described on BoingBoing, it demonstrates a range of strategies that are possible in a multiplayer game which is iterated and not zero-sum. Most of this was already familiar to me from the international relations and environmental politics literatures, which are full of talk about prisoners’ dilemmas, security dilemmas, common property failures, and tragedies of the commons. The ‘detective’ strategy was new to me, however.
Game theory in general deserves criticism for being an inaccurate representation of actual human behaviour. Nevertheless, it has explanatory power in scenarios ranging from fishery depletion to tax evasion to nuclear war.