Koten, G.J.L., Munzil and Utama, C. 2023. Improving Critical Thinking Skills of Elementary School Students: Project Based Learning vs Gamification-Based Group Investigation. Journal for Lesson and Learning Studies. 6, 2 (Jun. 2023), 311–320. DOI:https://doi.org/10.23887/jlls.v6i2.60680.