2D video games refer to games in which actions take place in the 2D plane and usually move horizontally or vertically. In them, characters and environments are usually displayed in 2D. Their features compared to 3D video games are that they use flat graphics, called sprites, and do not have three-dimensional geometry. They are displayed on the screen as flat images, and the camera that follows the player has no perspective. The most famous type of 2D video games are platformers which are characterized by a large use of jumping and climbing to navigate the player's environment. Levels and environments mainly consist of uneven terrain and various platforms set at different heights which requires the use of different abilities of the player's own character to cross. The program used to create one level of a 2D video game in this final work is Unity. Unity was developed to make the development of 2D and 3D video games available to new and inexperienced developers. Its interface has been customized so that users can easily use all its tools and functions when creating projects. The paper describes its history and development, the user interface with a focus on the development of 2D video games, the basic knowledge of scripting and the main differences and options in Unity 2D. For the practical part, the process of creating a complete level of 2D computer game is described, from making sprites to creating the functionality of the main character and the enemy.