Due to the general gamification of our culture and society as well as the proliferation of games in our everyday activities, people are increasingly looking at games and gamification as a source for cooperation and other prosocial behaviors. However, not all game features lead to increased cohesion, cooperation or collaboration between people. While some games indeed are geared for cooperation, majority of games also aim toward competition or just non-social activity. Therefore, a prominent research problem exists in understanding how different game and gamification design may lead to altruistic sentiment and collective action. In this study, we investigated how the engagement with cooperative game features relates to the emergence of altruism and whether altruism leads to the formation of we-intentions in a gaming context. We employed data gathered among players of the augmented reality game Ingress (N=206) and analyzed the data using PLS-SEM. The results show that game features can give rise to altruism and that altruism can invoke we-intentions via cooperative goal structures (we-goals) of individuals. In addition to providing important insights regarding how cooperation emerges within games, this study provides implications for cultivating cooperation by gamification.