Questionnaire
The questionnaire consists of 21 questions in which 14 questions were answered by a 4-point Likert scale. Questions were divided into general information (7) and 3 domains consisted of learning content domain (3), game aspect domain (5), and learning experience domain (6). Fifteen students were selected for validity and reliability test of the questionnaire. The validity and reliability of the questionnaire were tested using face validity, Cronbach alpha, and the ICC test. The total Cronbach alpha score was 0.85 and can be categorized as reliable. The reliability of the questionnaire evaluated from the Intraclass Correlation Coefficient score had an excellent agreement (r = 0.98, 95% Confidence Interval (CI), 0.94–0.99).