‘Audiovisual Worldbuilding’ is an experimental tech demo designed to show that quality, immersion, and believability in a game world can come from the combination of sound and visuals that share high coherence. This project demonstrates how high-quality environmental sounds can significantly elevate a simple visual presentation, transforming it into an immersive audiovisual experience. For this project, TyranoBuilder was used to build a world with simple interactivity, and the Echotopia Soundscape Designer by SoundFellas was used to create ambient sounds for each room.