Gamification in Online Learning: A Systematic Review of Engagement and Learning Outcomes in Digital Education. Online Learning In Educational Research (OLER), [S. l.], v. 5, n. 2, p. 351–367, 2025. DOI: 10.58524/oler.v5i2.733. Disponível em: https://journal.foundae.com/index.php/oler/article/view/733. Acesso em: 16 jan. 2026.