The aim of this study was to investigate the effects on the students' academic achievement and theirattitudes of teaching with game based learning in "Reproduction, Growing and Development unit in Plants andAnimals" in Elementary 6th grade Science education class. Semi-experimental model based on pre test and posttest was used in the research. The studies were performed in a public school in Giresun in 2016-2017 academicyear. Sample of the research was composed of total forty students of sixty grades, 20 experimental group studentsand 20 control group students. This experimental study was carried out for 12 hours. While in the experimentalgroup, the activities prepared in the current programme and the educational games (taboo) prepared by theresearcher in addition to these activities were used, in the control group only the activities prepared according tothe achievements in the current programme were used. "Science Academic Achievement Test" and "ScienceAttitude Scale" were used as the data collection tool in the research. The obtained data were analyzed using SPSSpacket program. After data analysis, it was determined that a significant difference was found in academicachievements and attitudes towards science education course between experiment and control group were in favorof the experiment group. In other words, according to the results of the research, the students academicachievements of lesson that was taught by educational game increased and their attitudes towards the coursechanged positively. As a matter of fact, it is said that "game based learning" contributes positively to students'academic achievements and attitudes towards the lesson by starting from the findings of extensive literatureresearch and study. In addition, if game based learning is actively used in other lessons, it can enable for studentsto learn by enjoying and having fun.