<p>Previous studies examined the impaired risky decision-making of individuals with Internet Gaming Disorder (IGD) using monetary rewards, while neglecting social rewards, whether related to gaming or real-life contexts. The theory of cognitive miserliness suggests that reduced sensitivity to variations in reward magnitude and risk level (miserly response) may impair risky decision-making. Thus, this study aims to examine how reward magnitude (Experiment 1) and risk level (Experiment 2) influence risky decision-making under game-related and real-life social rewards through two experiments. In Experiment 1, 32 individuals with IGD (<i>M</i>_age = 20.06 ± 1.48, 62.5% female) and 36 healthy controls (HC) (<i>M</i>_age = 19.83 ± 1.83, 77.8% female) completed an adapted Balloon Analogue Risk Task (BART) to explore the impact of reward magnitude on risky decisions regarding game-related and real-life social rewards. In Experiment 2, 39 those with IGD (<i>M</i>_age = 20.18 ± 1.78, 61.5% female) and 44 HC (<i>M</i>_age = 19.86 ± 1.64, 61.4% female) completed an adapted BART to investigate the impact of risk level. The results indicated that in game-related social rewards, both individuals with IGD and HC could perceive reward magnitude and risk level, enabling them to adjust risk preferences and avoid risks. However, compared to HC, individuals with IGD had reduced sensitivity to variations in reward magnitude and risk level (miserly response) under real-life social rewards, displaying an inability to avoid risks. The results suggest that in game-related social rewards, individuals with IGD show unimpaired risky decision-making. However, in real-life social rewards, their decision-making is impaired and their miserly response to rewards and risks perception may explain this impairment.</p>