Spatial ability is frequently encountered in professional disciplines and daily life. In general, it includes abilities such as rotating objects, estimating the appearance of objects based on a person's position, and being able to think of open and closed forms of three-dimensional objects. It is essential in learning and teaching geometry. In this research, we tried to examine the spatial abilities of 6th grade students through Visualize-Predict-Check (VPC) heuristic in a computer-based environment (GeoGebra). In the research, we designed the teaching materials according to the topics such as reflection, translation, rotation, view from different directions, and expansion, which are included in the mathematics curriculum. The experimental method was used in the research, and the Spatial Reasoning Instrument (SRI) was used for pre-test and post-test. The research groups were 75 students selected from 223 6th grade students studying in four public secondary schools in a large province of the Black Sea Region during the 2022-2023 academic year. These students were selected according to their pre-test scores and were divided into three heterogeneous groups of 25 students each. The result of the research indicates that through the VPC heuristic, there was no statistically significant difference between the scores of the first group of students in the spatial reasoning instrument when teaching was carried out only according to the visualization component. However, there was a statistically significant difference between the scores of the second and third group students in the spatial reasoning instrument when teaching was carried out, respectively, according to the visualization prediction and visualization-prediction-control components. Based on the findings, suggestions were made for further research. [This paper was published in: "EJER Congress 2023 International Eurasian Educational Research Congress Conference Proceedings," Ani Publishing, 2023, pp. 538-553.]