Cooperation skills are an important aspect of early childhood social-emotional development that needs to be fostered from kindergarten. Based on initial observations in Group B of TK Kemala Bhayangkari 87 Mojosari, some children were still unable to cooperate optimally in group activities, were less active in helping their peers, and had difficulty participating in completing group tasks. This study aims to improve children’s cooperation skills through the Cooperative Adventure Mission game in Group B of TK Kemala Bhayangkari 87 Mojosari during the 2026/2027 academic year. The study employed Classroom Action Research (CAR) using the Kemmis and McTaggart model, conducted in two cycles consisting of planning, action, observation, and reflection. The subjects were 24 children. Data were collected through observation, interviews, documentation, and field notes, and analyzed using quantitative and qualitative descriptive techniques. The success criterion was set at a minimum of 85% of children achieving the expected developmental criteria for cooperation skills. The implementation of the Cooperative Adventure Missiongame is expected to improve children’s cooperation skills through activities involving communication, collaboration, mutual assistance, and completing missions in groups. This game is also expected to serve as an innovative, active, and enjoyable alternative learning strategy for developing early childhood social-emotional skills.
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