Previous research has demonstrated a positive influence of cooperative video game play on participants’ cooperative strategies (tit-for-tat behaviors) in a modified Prisoner’s Dilemma task (Ewoldsen et al., 2012). The current study tested whether these positive effects are applicable to ingroup and outgroup conflict. Eighty participants were assigned to play a violent video game cooperatively or competitively with a confederate posing as an outgroup or ingroup member. The main findings corroborate previous research on the beneficial effects of cooperative game play and suggest playing cooperatively can increase helping behavior. Furthermore, cooperation with an outgroup member can actually reduce aggression. Implications of findings for future research are discussed.