Conventional rehabilitation after acquired brain injury is typically carried out using paper-and-pencil tasks, or focuses on compensatory strategies to overcome cognitive deficits. By adding gamification, interaction, and the immersive components of VR to rehabilitation, the engagement and motivation of patients towards their rehabilitation will increase. Virtual reality provides immediate visual, as well as auditory, feedback and allows for more intensive and repetitive training which is crucial for inducing neuroplasticity and achieving optimal health outcomes. With Koji’s Quest, treatment can be tailored to each individual patient’s needs and the difficulty level of each game automatically adjusts based on performance. All in all, VR is suited to use as adjuvant treatment to overcome some of the limitations of conventional therapy. Clinicians benefit from using Koji’s Quest because it provides the opportunity to easily monitor and evaluate the patient’s rehabilitation progress and interact with the patient in the clinician interface, whilst saving time for administrative work as patients can train by themselves after being instructed how to do the tasks. Additionally, less continual supervision is needed since Koji, the virtual companion, guides patients through the virtual world and helps reduce their anxiety.