This paper aims to review the issues related to designing rich interaction paradigms in the context of serious games and 3D virtual environments for educational purposes. Serious games are applications specifically designed for training users to acquire particular skill sets. They possess the ability to draw the player's attention and give him the feeling of uniqueness and individualization in the environment, building knowledge based on connecting a new experience with a previous one. The effectiveness of a virtual environment is influenced by various factors, such as sense of presence (the feeling of being immersed in an environment although not being actually there), mental and emotional involvement, motivation, sense and flow and achievement etc. We also discuss the design principles related to creating complex environments and setting the game's goals and objectives, in order to ensure the player's progress and a pleasant, enriching user experience.
In the near future, we aim to design a game with hierarchical levels of difficulty that would provide auditory and haptic stimuli and follow general game design and learning principles, such as learning by doing or experimenting, reflection and meta reflection - that is the learning transfer from virtual to live contexts. Particular attention will be dedicated to level design, immersion (by emphasizing the role of the player as the protagonist - offering the feeling that the training is addressed to him, interaction design - sense of control through relevant provided by the game and motivation that is triggered by necessity, fun, curiosity, interest and sense of achievement. Moreover, the highest focus will be concentrated towards ensuring a sense of flow, in order to make the player feel at ease with the task and skills achievement. Our contribution will be two-fold and materializes in improving the blind subjects' sound localization and navigational skills and providing