Scent Ninja: An Exploratory Study of Olfactory Cues, Presence, Immersion, and User Experience in Active Virtual Reality Gameplay

Despite the growing sophistication of immersive virtual reality (VR) technologies, olfactory feedback remains underexplored in VR gaming. This study introduces Scent Ninja, a VR fruit-slicing game integrated with a custom head-mounted olfactory virtual reality display, and explores whether event-triggered fruit scents are associated with differences in presence, immersion, user experience, and gameplay performance. A total of 12 participants completed scent evaluation trials and gameplay sessions with and without scent. Results show that detection time, recognition, intensity, and pleasantness varied across stimuli, with Pineapple and Lime producing stronger perceptual responses. During gameplay, scents were associated with significantly higher transportation-related immersion ratings, while no significant differences were observed for presence, other immersion items, user experience, or gameplay performance. A significant order effect in perceived scent intensity suggests that sensitivity to olfactory cues may vary with task context and prior exposure within the gameplay environment. Qualitative feedback highlights the perceived importance of scent timing, odor fidelity, intensity, and alignment with in-game actions. The findings provide exploratory evidence that event-triggered olfactory cues may support the transportation dimension of immersion during active VR gameplay, while emphasizing timing, scent intensity, perceptual clarity, and contextual congruence as important design considerations for olfactory VR design.