This study reports on the use and effect of the film-based WBT courses. With the diversification of scholastic ability rapidly advancing, there is a great need for meticulous teaching responding to various proficiency levels. In that context, films have great potential as effective teaching materials for their motivational effect. Their use, however, is likely to be limited to within the classroom due to the copyright restrictions, and it's not easy to extend their effect to out-of-classroom study. Also, the substantial time and effort required for producing teaching materials are often a burden on teachers who use films in their classes. Thus, in order to accommodate the needs of those teachers, two WBT courses were developed with the use of public domain films. These multilevel courses aim to support learners in their out-of-classroom study, as well as to help teachers produce teaching materials of varied proficiency levels. An experiment was conducted in this study to verify the effectiveness of the courses. The results revealed that the WBT courses were effective in helping improve the listening abilities of learners of different proficiency levels. The implications of the findings are also discussed.