 How can cooperation emerge in a society of self-serving egoists? In the game-theoretic context of the Prisoner’s Dilemma, these results indicate that iterated interaction, spatialization and structured interaction, and noisy information can all facilitate cooperation, at least in the form of strategies such as Tit for Tat. When all three effects are combined, the result appears to be a level of cooperation even greater than that indicated in Nowak and Sigmund. Within a spatialized Prisoner’s Dilemma using stochastic strategies, it is strategies in the region of probabilities \(1 - ε\) and 2/3 that emerge as optimal in the sense of having the highest scores in play against themselves without being open to invasion from small clusters of other strategies (Grim 1996; Grim, Mar &amp; St. Denis 1998).