Sharples, JakeWilliams, BenjaminReeves, ShaunSheng, YunSlingsby, Aidan2025-09-092025-09-092025978-3-03868-293-6https://doi.org/10.2312/cgvc.20251207https://diglib.eg.org/handle/10.2312/cgvc20251207The integration of effective user interfaces (UI) is critical in the rapidly evolving landscape of video games and particularly within virtual reality (VR). Poor UI design can have a negative impact on immersion by breaking such engagement, create cognitive overload, and detract from the overall experience of the player. This paper investigates a strategic implementation of two primary categories: diegetic interfaces, which are integrated into the game world, and non-diegetic interfaces, which exist outside the games fictional space. A simple VR game was created to test both diegetic and non-diegetic UI principles gaining feedback to assess the purpose and usability of the two methods for the application into future projects and research.Attribution 4.0 International LicenseCCS Concepts: Computing methodologies → Perception; Human-centered computing → Interactive systems and tools; Virtual realityComputing methodologies → PerceptionHuman centered computing → Interactive systems and toolsVirtual reality10.2312/cgvc.202512075 pages