As a part of this graduate thesis, a computer simulation of the educational robot mBot was created. In this paper are described the motivation of the development itself and the tools used to develop the simulation. After that, the simulation, everything implemented within the simulation, as well as all its parts, such as the accompanying files are described in detail. Customisation options of the simulation are also described. In addition, the paper describes the more significant problems encountered in the development of robotic simulations. For example, determining the position of a robot (as two-wheel drive vehicles) when moving, creating the interface itself, and displaying images in different ways, collision detection, etc. The aim of the paper is to apply simulators in schools. Therefore, within the scope of the paper, are described ways in which the simulator can be applied. Several examples have been set out and it is described what is achieved by implementing these examples. In addition, they highlight the various problems that arise when programming the educational robot mBot, but also in general when programming physical objects. As part of the paper there is a platform for further development of the simulation, as well as ideas and plans for further development.