With the increasing popularity of computer gaming, the growth of game engines popularity comes as no surprise. The thesis shortly presents the changes that led to games as we know them today, followed by presentation of their history. The main focus is on the presentation of Unity and Unreal Engine. Unity is the most used game engine which was developed by Unity Technologies in 2005. Unreal Engine is known for its amazing graphic. It was developed by Epic Games in 1998. Their main functions enable developers to create games in an easier way. What follows is a presentation of the games developed using both engines, extended by the comparison between the two from different points of view. We compared and assessed source code access, creation of new game objects, graphics and other characteristics. Both engines have advantages and disadvantages. Unity is a better choice when developing two-dimensional and mobile games, while Unreal is more suitable for developing three-dimensional games.