Play has becoming a cultural, educational and social phenomenon of great relevance. As an educational tool, play not only has an active practical aspect but can also be widely used in teaching a range of technical and scientific disciplines, such as physics, chemistry, and mathematics.

Chemistry is one of the fundamental sciences that every person with a minimum cultural background should have knowledge of. However, primary and secondary school students' interest in it is poor and limited. This can be explained by their reduced assimilation of the fundamentals of science and their subsequent advancement in the study of chemistry, which creates enormous gaps in their understanding of the subject. To solve this lack of interest, it is necessary to introduce again the strategy of educational games as a teaching method.

The aim is to analyze how the various forms of chemistry games increase science knowledge of elementary and secondary school students. Furthermore, we want to highlight our interest in understanding and promoting the impact of play as a transformative tool in education and to foster active and participatory learning in science.
Working in general science knowledge, posters with approximately ninety numbered images of scientists were used. They were physicists, mathematicians, chemists, biologists, doctors and more, all with explanatory sheets. After that, through mathematical calculations, science teachers have guided students toward a specific scientist who were studied later.

For chemistry knowledge, cards with chemists and laboratory equipment pictures were used; students could play by finding the corresponding scientist. Afterwards, students answered some questions about scientists, their live, their era, and their contribution to chemistry.

The difficulty of the presented games will depend on the curriculum at each educational level and also the needs of primary and secondary science teachers.

These activities have had a positive impact on educators, science teachers, and have significantly increased the importance of educational play and its introduction into the science teaching-learning process in primary and secondary school.

Keywords: Games, scientists, chemists, students, primary school, secondary school.