The emergence of virtual worlds and simulation games provide ample opportunities for developing cultural competence by offering a visual, contextual, immersive, and interactive experience. Learners can benefit from contextual interactions and develop cultural competencies by fulfilling quests or exploring the environment. However, most of the existing systems contain few pre-designed scenarios, inadequate for covering unique aspects of different cultures. This study introduces a situation creation toolkit for teachers and learners to design their culture-specific scenarios in a 3D environment and share it with others to experience such situations. In a preliminary experiment, 37 English learners with different cultural backgrounds created a scenario, specific to their culture, and provided proper/improper communicative choices as well as cultural-related notes. Scenarios were then exchanged to those of different cultures for role-playing and decision-making. Results highlighted the influence of L1 culture and stereotyping when facing an unfamiliar cultural context, thus leading to culturally unacceptable behavior. Findings suggest that through real-life scenario design and experience, our platform can prepare learners to interact in culturally appropriate ways and encourages them to gain cross-cultural competence. [For the complete volume, "CALL for Widening Participation: Short Papers from EUROCALL 2020 (28th, Online, August 20-21, 2020)," see ED610330.]