The development environment HOERSPIEL provides a platform for interactive applications based on sounds. It allows the creation of virtual acoustic worlds for user interaction with sound objects. A special interface detects the user’s movements for controlling his avatar. HOERSPIEL can be used to realise various applications: - Innovative computer games HOERSPIEL can create virtual reality without any visual output. The idea is to build virtual worlds through sound only, which stimulates the player’s fantasy and offers completely new gaming dimensions. Furthermore, it is possible to create computer games for visually handicapped people.