This research will test the following hypotheses: H1: Violent game content will increase aggressive behavior, even when games are identical in all ways save violent content. [The authors hasten to point out that a null finding, supported by an adequate Bayes factor, will still be compelling, given the projects' improved experimental control relative to other previous studies]. H2: Difficult games will increase aggressive behavior relative to easy games. Per Engelhardt, Hilgard, & Bartholow (under revision), subjects who play a difficult game exhibit impaired cognitive control immediately afterwards. Thus, fewer cognitive resources should be available to inhibit aggression. H3: Lower 2d4d ratio will predict greater aggression. Research indicates that greater prenatal testosterone exposure, as measured by 2d4d ratio, is associated with greater aggression, although this effect may be moderated by context. As all participants are insulted, we expect the context to reveal an effect of 2d4d ratio. H4: Combinations of aggression-inducing factors tested in H1, H2, and H3 should lead to superadditive increases in aggression, as predicted by I3 theory and the General Aggression Model.