<![CDATA[This study aims to develop interactive games on counting materials for mild mentally retarded students in Inclusion Elementary School and to determine the validity, practicality, and effectiveness of interactive games. The development is carried out using the ADDIE model which consists of 5 (five) stages, namely analyzing, designing, developing, implementing, and evaluating. The data collection instruments used were observation sheets, interview sheets, material expert validation sheets and media experts, teacher response questionnaire sheets, and student test sheets. The data analysis technique used is data observation, data interview, data validity analysis, data practicality analysis, and data effectiveness analysis. In this study, the results of material expert validation were 97% (valid) and media experts were 88% (valid). The results of the teacher response questionnaire were obtained with a percentage of 90% (very practical). And student test results showed very effective criteria used with individual completeness scores of 80% and 90%. The data generated from the validation, teacher responses and student tests show that the interactive games developed are feasible, very practical, and very effective to use.]]>
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