Qohar, A., Susiswo, S., Nasution, S. H., & Wahyuningsih, S. (2021). Development of Android-Based Mathematics Learning Game on the Topic of Congruence and Similarity. International Journal of Interactive Mobile Technologies (iJIM), 15(09), pp. 52–69. https://doi.org/10.3991/ijim.v15i09.20723