This study aims at analyzing the unsustainability causes of kalego as one of traditional games of Muna communities in Watopute District, Muna Regency, Southeast Sulawesi. Data collection was conducted through participant observation, interviews, surveys, and focused discussion. Data analysis was conducted qualitatively and descriptive statistic by employing data reduction technique, data presentation and conclusion. The results showed that kalego traditional game has been degraded or unsustainably practiced as the impact of the low awareness and low understanding among Muna community toward this traditional game. Approximately 71.25% Muna community in Watopute district cannot play the traditional game. The unsustainability of kalego was caused by several factors namely; 1) the absence of the family inheritance about kalego traditional game and the decreasing number of old figures who understand Muna culture contribute to the decreasing of local culture knowledge among younger generations; 2) Cultural encounters which results incorporated acculturation toward Muna's local culture; 3) the absence of the massive kalego game staging.