T The advancement of virtual reality (vr) technology has created opportunities for developing interactive and experience-based learning environments, particularly in the hospitality domain. however, existing studies have primarily focused on learning effectiveness and have rarely evaluated system functionality in depth, especially regarding the implementation of adaptive learning mechanisms such as scaffolding and fading assistance, which are essential for children with down syndrome. this study aims to evaluate the success rate of the functional implementation of the leveling system in a vr-based hospitality training module, covering the leveling (hint), interaction, and task flow features. testing was conducted using a scenario-based black-box testing method through the development of test cases representing user interactions at each level, which were then analyzed by comparing the expected results with the actual results. testing of 2,630 test cases over four weeks, from 3 june to 27 june 2026, resulted in an overall success rate of 92.05%, with individual feature success rates of 93.23% (leveling/hint), 91.39% (interaction), and 92.10% (task flow), while all learning levels recorded a success rate above 85%. these results indicate that the three features functioned in accordance with the intended design and scenarios, and that the scaffolding and fading assistance mechanisms operated consistently across all levels, demonstrating that the leveling system implementation in the vr-based hospitality module is reliable in supporting adaptive learning for children with down syndrome.