This study aims to develop valid, practical, and effective Baamboozle-based learning media for the Area and Perimeter of Flat Shapes material in grade V of Elementary School. The research design uses a mix method. The type of research is development research with the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). Baamboozle-based learning media was validated by material experts by 90, media experts by 95, and language experts by 93.33 with the category "Very Valid". The results of the practicality of the questionnaire responses of teachers and students of class VA SDN 41 Kuranji were 90.6, in VB SDN 41 Kuranji by 93.83, and SDN 18 Air Tawar Selatan by 93.83 with the category "Very Practical". The effectiveness test of the three schools was obtained from the results of the hypothesis test with the normality test and the Mann-Whitney U test, namely the significance of ˂ α (0.05) so that H0 was rejected and H1 was accepted, then the data was not normally distributed and there was a difference in the average between the pre-test and post-test. In addition, the average pre-test and post-test increased so that it was effective to use. Based on these results, it can be concluded that the Baamboozle-based learning media for the Area and Perimeter of Flat Shapes material in grade V of Elementary School that was developed is very valid, practical, and effective to use in learning.