“…In this context, board games have been developed as learning materials in various fields such as medicine, chemistry, geology, physics, finance, environment, language, culture, history, and sociology, taking advantage of the concept of learning while having fun [20]. The rise in "serious games" (SGs) [21], which aim to solve social problems, has also led to an increase in the number of SGs on local issues, and recently, many regionally-based SGs have been developed (e.g., [22][23][24][25][26]). Although many SGs on water issues have been created [27], few have focused on the hydrological cycles of small islands in tropical or subtropical regions.…”