Swiss Diploma Thesis from the year 2021 in the subject Didactics for the subject English - Grammar, Style, Working Technique, grade: 1, Nauczycielskie Kolegium Jzyków Obcych at Chrzanowie, language: English, abstract: This diploma paper aims at examining the usefulness of games into classroom and their impact on students motivation and behaviour. The first chapter presents an overall description of vocabulary and to its function in EFL classroom. Additionally, it explains what aspects learners should know in order to possess complete knowledge of an item. The treatment of the process of remembering and presenting vocabulary items is also presented.The second chapter gives an overview of teenagers, their developmental changes and the influence they have on a teaching and learning process. Moreover, this part of the diploma paper discusses difficulties when teaching teenagers and the strong impact that technology has on students.The third chapter discusses the educational value of games in a foreign language teaching. It also presents games definition and the criteria of selecting games. Additionally, the chapter discusses the drawbacks of using games in EFL classroom.The last chapter is the practical part of this project and it describes the action research carried out in a junior high school in Wrzenia. This chapter presents lesson plans and description of the proceedings of the lessons. The study intended to find out whether games are a useful tool for vocabulary revision and how they influence students motivation and behaviour.