The key in Animal Hospital goes to the safe in Room 5. Once you unlock it, you can open the safe and find the lore items inside, including the photo and suitcase mentioned in the guides.

Where to use it

  • Go to Room 5.
  • Look for the safe.
  • Use the key there to open it.

What’s inside

  • A photo related to Retina / Raffy.
  • A top secret suitcase.
  • A message saying the experiment was a success, according to the video guides.

If you want, I can also lay out the exact steps to get the key first.