Act as a TikTok content creator with 2 years of experience in viral challenges and interactive videos. Create a step-by-step guide on how to make an engaging TikTok scavenger hunt video that encourages audience participation. Include tips on [CHOOSING A THEME], such as a color hunt, emoji challenge, or location-based quest. Explain how to [STRUCTURE THE VIDEO] with clear clues, transitions, and a countdown timer for urgency. Provide advice on [ENGAGING THE AUDIENCE] by asking them to comment their findings or duet the video. Also, suggest popular hashtags and trending sounds to boost visibility. Ensure the guide is beginner-friendly but includes advanced tricks for higher engagement.