Game theoretical social dilemma games provide a framework for studying how decisions are made in social dilemmas. It has been suggested emotions—e.g., anger or guilt—can influence the decision process. Recently two human experiments were conducted to gain insight into what effect, if any, emotions have on decision making in public goods and group competition games. In this paper we present a simple computer model that emulates those game-theoretical human experiments. Simulation results indicate anger and guilt have very different effects on decision making depending on the type of social dilemma under investigation.