<![CDATA[The use of learning media games in learning mathematics can make students more interested and easy to understand concepts in mathematics lessons. The aim of this research is to produce a game to help students understand the gradient of a line through two points. The development of this game using the GeoGebra software version 5 uses the Thiagarajan 4D development research method which consists of four steps, namely defining, designing, developing, and disseminating. To produce a game that is valid, practical, and effective, a series of trials are carried out, namely expert testing and development testing. The results of the validity test show the game's validity score is 3.76 with a very valid category. The practical test conducted on 5 students showed a 100% presentation in the very practical category. The effectiveness test using One-Group Pretest-Posttest Design shows that this media is effective in improving student learning outcomes.]]>
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