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User engagement in Virtual Reality (VR) games is crucial for creating immersive and captivating gaming experiences that meet the expectations of players. However, understanding and measuring these levels in VR games presents a challenge for game designers, as current methods, such as self-reports, may be limited in capturing the full extent of user engagement. Additionally, approaches based on biological signals to measure engagement in VR games present complications and challenges, including signal complexity, interpretation difficulties, and ethical concerns. This study explores body movements, as a novel approach to measure user engagement in VR gaming. We employ E4, emteqPRO, and off-the-shelf IMUs to measure the body movements from diverse participants engaged in multiple VR games. Further, we examine the simultaneous occurrence of player motivation and physiological responses …