The key in Animal Hospital is tied to a recurring visitor named Ratthew, and it points to a locked safe hidden inside Room 5. Getting it takes patience across several shifts, but the payoff is a set of story items that connect Ratthew, his missing twin, and the Animal Corporation.
Quick answer: Serve Ratthew every time he visits your office (usually around Shift 8 to 10). After his final conversation, he leaves the key on the spot where he was sitting. Pick it up, go to Room 5, pull down the wall poster to expose the safe, then use the key on it.
How to get the key from Ratthew
The key drops from Ratthew, a black animal character who shows up in the hospital across multiple shifts. You cannot buy it or find it lying around. He hands it over only after you have treated him through enough of his visits, which most players complete around Shift 8 to 10.
Note: If Ratthew has not handed over the key yet, you almost certainly have not met him enough times. Keep serving him on each return visit until he leaves it behind.
How to use the key in Room 5
The key has one job. It opens a safe hidden behind a poster in Room 5. There is no puzzle to solve afterward, so once the safe is open, you are done.
What is inside the safe
The safe holds story items rather than gameplay rewards. There is no new pet, currency, or class waiting inside. Instead, you get three clues tied to the game’s ongoing mystery.
| Item | Detail |
|---|---|
| Photo of Ratina | Ratthew’s twin sister, who worked for the Animal Corporation before vanishing with no note or warning |
| Suitcase marked “Top Secret” | A classified case suggesting hidden corporate or experiment records |
| Short message | Reads: “The experiment was a success. The shadow now sees everything.” |
What the safe means for the story
Everything in the safe lines up with what Ratthew says during his visits. He explains that the Animal Corporation is after him because he knows secrets the company wants buried, and he says he is not the anomaly many players assume he is.
Ratina is described as the smarter twin who worked inside the company and then disappeared without explanation. Her photo sitting next to a top-secret suitcase and a note about a successful experiment strongly suggests her disappearance is connected to whatever the corporation was testing. The mention of “the shadow” introduces another figure the game has not explained yet, leaving a thread that later updates are set up to expand.
If you have already earned the key, it is worth opening the safe and reading everything inside, since the contents are the whole reward and the clearest look yet at what happened to Ratthew and his sister.
