The growth in the casual gaming market reflects the rising popularity of mobile match-three games such as Candy Crush Saga and Royal Match. As the mechanics and layouts of match-three games remain similar, the significance of visual design is becoming more critical. This thesis investigates the visual elements in match-three mobile games Candy Crush Saga and Royal Match, in order to assess their impact on the game experience. The study focuses on how basic design principles and user interface elements contribute to usability and visual appeal, thereby shaping players' engagement with the games. An online survey of 331 participants was conducted to collect data about insights from both match-three players' and non-players perceptions of visual design elements. Survey findings were obtained regarding highlighting and the effectiveness of color contrast, harmonious design elements, and clear visual hierarchy as approaches to enhance user experience. Based on these responses, visual recommendations for developing future match-three mobile games that focus on utilizing visual design principles effectively and achieving an optimal balance between aesthetics and clarity were suggested.