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Nafis, A.M.A. and Herumurti, D. 2020. EFFECTIVENESS STUDIES OF THE LEARNING BASIC MATHEMATICAL OPERATIONS ON USERS USING EDUCATION GAMES WITH ESCALATING DIFFICULTY LEVEL IN SEVERAL TYPES OF GAMES. JUTI: Jurnal Ilmiah Teknologi Informasi. 18, 2 (Jul. 2020), 115–124. DOI:https://doi.org/10.12962/j24068535.v18i2.a989.