Social studies learning in elementary schools is still hampered in encouraging active participation and building students' in-depth understanding, due to the lack of activities that encourage students to examine real-world problems. The limited use of media causes students to lose interest in learning, resulting in suboptimal learning outcomes. This study aims to improve the cognitive learning outcomes of third-grade elementary school students through the implementation of the PBL model assisted by the game quizwhizzer. The method used is Classroom Action Research, which was carried out in two cycles through the stages of planning, implementation, observation, and reflection. The research subjects were 26 students, 11 boys and 15 girls. Data collection techniques used tests and documentation. Data were analyzed using descriptive approaches quantitatively and qualitatively. The results of the study show that the PBL model assisted by quizwhizzer can improve student learning outcomes. The average score increased from 71.15 in cycle I to 81.73 in cycle II. The percentage of learning completion also increased from 65.38% in cycle I to 84.61% in cycle II. Therefore, the PBL model assisted by quizwhizzer has proven effective in improving students' cognitive learning outcomes in social studies learning in elementary schools.
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