ISTIONO, Wirawan. Leveling up difficulty model based on user experience in education games mobile-based for student kindergartens. IJNMT (International Journal of New Media Technology), [S. l.], v. 7, n. 1, p. 18–22, 2020. DOI: 10.31937/ijnmt.v7i1.1666. Disponível em: https://ejournals.umn.ac.id/index.php/IJNMT/article/view/1666. Acesso em: 27 jul. 2025.