The development of smart phones with touchscreeen technologies as well as multiuser / multitouch application development becomes more complex, especially the application for entertainment, whose market is becoming more and more demanding. Modern customers are becoming more demanding, requiring an attractive and interesting design with perfect functionality. Specific application has to adapt to users in series of segments. One of the most important segments that we must adapt to new users is the design of the user interface. The user interface and it's design, is the first user's interaction with the application and user must like it. If the user does not like the design he will simply look for the application of the same content but with a better design. People are visual creatures, and based on first glance estimate a large number of things and situations in life. The focus of this thesis is aimed to investigate how the design of the user interface helps the attractiveness and user satisfaction. In this sense, this diploma work will determine and describe parameters that most influence the design of the user interface for applications for mobile devices. The practical part of this work is the development of game application in object-oriented programming language ActionScript. Runtime AIR (Adobe Integrated Runtime) will be used as a cross-platform.