In my experience playing this game, tracking down all 16 varieties of hot spring eggs was both challenging and rewarding. The key is to first complete the "Hot Spring Egg Appointment" quest given by the little ghost character, which unlocks access to all eggs. Each day, you need to take a photo of the specific hot spring egg when the white name tag appears—if it doesn’t show up, the photo won’t count. What helped me greatly was paying close attention to unique landmarks mentioned in the locations, such as the table inside the sample room behind Black, the rooftop of Massimo’s booth, or the lamp post opposite Deer Tapati. After photographing the egg, you can then spot the furniture bubble nearby, which confirms the egg’s presence. For example, on day 7, the black egg is behind Black in the sample room, while on day 4, the cyan egg is behind Black’s stall. Another useful tip is to use the in-game camera carefully: aim precisely at the glowing hot spring aroma to trigger the white label with the egg’s name. Missing this step means your capture won't register, so patience is key. Collecting all eggs unlocks a permanent hot spring egg recipe, a fantastic reward for dedicated players like me. Overall, this treasure hunt adds depth and fun, encouraging exploration of different spots like Volcano Lake and Wanya Town. I recommend taking notes or screenshots of each location as you go, to avoid confusion, especially for the more elusive eggs like egg No. 16. Enjoy the journey and the delightful surprises each egg brings!