This course aims to introduce fundamentals of immersive systems (VR/AR/MR/XR, simulations, gaming) and related concepts together with giving development knowledge of virtual environments, immersive interaction techniques and implementation of various display technologies. It is facilitated by a series of design/development assignments where the students individually or in groups code, prototype and test interactive XR/Game/Simulation projects. The course covers related literature and practice starting from the original Computer Science and HCI concepts following all related technologies including spatial computing for XR, motion capture, 2-D & 3-D modeling, multisensory interaction with IoT, games and experience design.