Virtual reality (VR) has brought about numerous alternative learning opportunities in the last decade, and with modern products such as Oculus Rift and other wearable Virtual Reality technologies being introduced into society, VR will promisingly continue to provide yet unseen opportunities in the next few decades and therefore is a technology that deserves serious consideration and study. In an attempt to better understand how virtual worlds positively affect student learning, this study used an online 3D VR English language learning platform and conducted an experiment to evaluate the student learning effectiveness based on Bloom's cognitive complexity level. t test analysis was used to determine the effectiveness of the learning platform, while structural equation modeling (SEM) analysis was used to determine the learning model behind the pedagogy. Participants were 448 students at a science and technology university in Taiwan. Results show that students improved their phonological, morphological, grammar and syntax knowledge, and virtual world learning assisted in the development of a more complex and higher level of thinking. The SEM analysis results indicated the virtual learning environment with unique features of immersion and ease of use, together with help-seeking positively affected student language cognition.