**2. Method**

An MI-BCI review could provide instructions for better game design in the future. We finished a pre-literature review to ensure the scheduled literature review method is achievable. After pre-reviewing, this paper believes that although existing MI-BCI games are various, the research fields regarding what MI-BCI games have been used and what game genres are more preferred for MI-BCI training than others are still virgin land. Thus, a systematic review (SR) based selection strategy could be used in this review to present data objectively. However, a meta-analysis is challenging because of the limited number of published articles and reported trials. Thus, the following part will introduce how this review attempts to utilize PRISMA [26] for scientific analysis.
