Technologies are generally described to dynamically alter a game while a gamer is playing the game so as to affect the gaming experience experienced by the gamer. According to some examples, one or more physiological signals may be collected from a gamer as the gamer is playing a game. Based on the collected physiological signals, a Quality of Experience (QoE) vector that indicates the gaming experience of the gamer may be generated. The QoE vector may then be compared with a corresponding value of a predetermined QoE function, and the game may be altered based on the comparison.