We describe the development and evaluation of the educational musical computer game for preschool children that offers a first experience with music education. The game is used as a case study to demonstrate, evaluate and discuss the principles of game design for digital game based learning. We describe the game's scenario along with the explanation of the logics and mechanics of this game, and present its evaluation from the educational point of view. The game fills the niche of the Lithuanian educational musical games, while the study results show that preschool children show great interest in exploration and creation of musical sounds thus ensuring the enrichment of educational game-based process with elements of creativity and emotional learning.