![]() 119 Scratch projects were examined according to criteria and 9 games with different levels were selected. For the current study, the selected projects are limited to the theme of the game. Scratch scores in three different levels such as beginner, intermediate and upper level. In this study, Scratch projects were classified according to their Dr. Scratch was used to the process of selecting quality Scratch projects under seven aspects over twenty-one points. Within the scope of the research, six projects that are shared openly with users and site visitors on the Scratch site were selected. This study aims to obtain mathematical concepts that students need while developing a Scratch project based on the Turkish national elementary mathematics curriculum. Scratch was designed by the Massachusetts Institute of Technology (MIT). The students mainly found learning by designing games entertaining, and the implementations conducted useful in terms of learning geometry. The results revealed that the block-based game development activities carried out using the goal-based scenario approach significantly affected the students’ computational thinking skills and achievement levels in polygons in favor of the posttest. The quantitative data obtained were analyzed using t-test, and the qualitative data were analyzed using content analysis. ![]() ![]() The Computational Thinking Skills Scale, polygons achievement test and a structured interview form were used to collect data. Within the scope of the study, a goal-based scenario about the topic of polygons was presented to the students, and implementations were carried out. The participants were determined using the criterion sampling technique a purposeful sampling technique. Overall, 43 seventh-grade students from a district of the province of Van, Turkey, during the 2021–2022 academic year constituted the participants of the study. The study used a one-group pretest-posttest experimental model an experimental research design. The aim of study to investigate the effects of block-based game development activities carried out on the goal-based scenario approach on the geometry achievement and computational thinking skills of seventh-grade students and to reveal their opinions regarding the process.
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