This master's thesis describes the use of microtransactions in video games and their influence over the game design, player experience, and virtual goods presentation. The goal was to compare the titles that use different monetization methods (paid and free to play games) and different types of microtransactions (functional and cosmetic), and to identify which parts of those games could be influenced by microtransactions and how. The research focuses on five titles - The Witcher 3: Wild Hunt, Assassin's Creed: Odyssey, Anthem, Warframe a Path of Exile. The first part of the thesis summarises the historical evolution of monetization models used in video games and defines the terms microtransaction, micropayment, virtual goods, or loot box. It also contains a typology of microtransactions, describes their implementation methods, and possible consequences tied to their use. The second part focuses on the analysis of the chosen five games. The research used the following methods - analysis of my own gameplay and mutual comparison of each game. Each game was examined over the course of ten hours, in sessions about 45-60 minutes long - the gameplay was accompanied by video recordings of the gameplay, screenshots, and a journal that contained detailed information about each gaming session. The research...