This study examined the effects of futsal-based game training on performance, self-efficacy, motivation, and exercise addiction in adolescent non-athlete girls. Thirty female students with no prior futsal experience were randomly assigned to either a traditional training group (n=15) or a game-based training group (n=15). Performance was assessed using a futsal skills test, while self-efficacy, sports motivation, and exercise addiction were measured via questionnaires. Both groups underwent separate 12-week training protocols. Analysis of covariance revealed significant differences between the game-based and traditional training groups in performance (P=0.0001), self-efficacy (P=0.0001), and sports motivation (P=0.0001). However, no significant difference was observed in exercise addiction between the two groups (P=0.531). These findings suggest that game-based training has a substantial impact on performance, self-efficacy, and motivation in adolescent non-athlete girls and may serve as an effective training strategy. The type of training method, whether game-based or traditional, does not appear to be a determining factor in the development or prevention of exercise addiction tendencies.