The color red has been shown to hinder performance, motivation, and affect in a variety of contexts involving cognitively demanding tasks [16, 47, 49, 22, 11, 32, 44, 64, 41]. Teams wearing red have been shown to impair the performance of opposing teams [7, 28, 57, 21], present even in online gaming [27]. Although color is strongly contextual (e.g., red-failure association), its effects are posited to be subconscious [15] and operate powerfully even on nonhuman primates, e.g., Rhesus macaques (Macaca mulatta) take food significantly less often from an experimenter wearing red [39]. Here, we present one of the first studies on avatar color in a single-player game. We compared players using a red avatar to players using a blue avatar. Using the Game Experience Questionnaire (GEQ) [26], we find that players using a red avatar had a decrease in competence, immersion and flow. Our results are of consequence to how we design and choose colors in single-player contexts.