We examined emotional valence- and arousal-related phasic psychophysiological responses to different video game events among 36 young adults who played Super Monkey Ball 2 (Sega Corporation, Tokyo, Japan). Event-related changes in zygomaticus trial. or, corrugator supercilii, and orhicularis oculi electromyographic activity, skin conductance level, and cardiac interbeat intervals were recorded. Instantaneous game events elicited reliable psychophysiological responses indexing valence and arousal. A largely linear, positive dose-response relationship between rewards obtained in the game and phasic increases in arousal was revealed. The valence of the emotional response varied as a function of the player's active participation (active coping). In addition, not only positive events, but also some putatively negative events elicited positively valenced arousal. The findings extend our understanding of the phasic changes in the emotional state during video games and a dynamic flow of events and action and may have several applied implications (e.g., for game design).