A small rat who stares at the cameras, gets mistaken for an anomaly constantly, and turns out to be holding the single most important piece of evidence in the entire game.
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Maintained by Riley Nook · Last updated July 12, 2026
lore cross-checked against community wikis, dev event listings, and player reports
Who he is
Ratthew is a small black anthropomorphic rat — white snout, two prominent buckteeth, a long curled pink tail, and ears that read more like a rabbit's than a typical rat's. He's paranoid and cautious from his very first visit, initially refusing to give his name at all ("being small has its advantages").
One detail the community had to learn the hard way: Ratthew maintains constant eye contactwith the player — the exact behavior that reads as a dead giveaway anomaly tell on every other patient. For him specifically, it's just how he is. Confirmed normal, no matter how unsettling it looks.
What he knows
Across several visits, Ratthew reveals he chewed up classified experiment reports in Ron from Accounting's office — on purpose, and without regret. He warns the player to trust no one in this hospital, and admits it hurts that everyone treats him like an anomaly when he isn't one.
On his final visit, he says he's uncovered a government secret and is being hunted for it. He mentions his twin sister Rattina— "the smart one in the family" — who worked at the Animal Corporation before she vanished. Then he hands the player a key, and disappears for good.
The Room 5 safe
Ratthew's key opens a hidden safe behind the cat poster in Room 5. Inside: a photo of Rattina, a suitcase stamped TOP SECRET, and a note reading "The experiment was a success. The shadow now sees everything."
This is the single most concrete piece of evidence in the entire game — everything else (Ron's comments, Dr. Harlow's briefcase, Liz's arrival) is circumstantial by comparison. The community reads the note as the origin story of the Stalker enemy, though the game itself never confirms it directly.
⏳ Still unconfirmed
What happened to Ratthew after his final visit — where he goes, or if he's safe
Whether the "shadow" in the note is literally the Stalker, or something else
Who specifically is hunting him, and whether it connects to Dr. Harlow or Animal Corp directly
Read Rattina's side
The twin sister he never stops looking for — everything we know about her.
He maintains constant eye contact with the player — normally a strong anomaly tell in this game — but it's confirmed to be a normal quirk specific to him, not a sign he's corrupted.
What is Ratthew's connection to the Animal Corp conspiracy?
He chews up classified experiment reports out of Ron's office, and his missing twin sister Rattina worked directly for the Animal Corporation before she vanished.
For shift-by-shift interaction steps, see the main wiki. Last checked: July 12, 2026.