Moonlight-chan Rinshan is an erotic quiz game. The player may select any of the eight available female opponents. He is then taken to a customization screen where he is prompted to assign points into quiz categories (history, geography, sports, anime, games, etc.) and types of clothes. The latter determine the intervals at which questions of a specific categories will be asked, and establish the minimum number of correct answers the player is obliged to give before losing the game. It is possible to balance the categories or invest half of the points into one which the player assumes to be particularly familiar with. Girls remove an article of their clothes after each successfully won round.