Shadow Rat is an minor antagonist appearing in Five Nights at Candy's 3. He is a shadow-version of Monster Rat. He appears in the Deepscape and in the Shadow Challenge.
Shadow Rat's appearance is similar to that of the RAT from FNAC 2. He has hollow eyes and jagged teeth. Much like the RAT from FNAC 2, Shadow Rat's forehead is stitched together. The sprite of Shadow Rat looks more similar to that of Monster RAT, seeing as how you can see his eyes when he is facing south.
Shadow Rat also has another form only seen in the "Shadow Challenge." The Shadow Challenge only includes Shadow Rat, a purple form of the original Monster RAT. He has no pupils, and is much more menacing than the Monster RAT, with a pose more elegant and pronounced than the Monster RAT's hunched over, beastly nature.
Shadow RAT's behaviour is similar to Monster Rat's but more aggressive and twitchy just like Monster Vinnie's behaviour.
When entering the Deepscape, shadow RAT will be patrolling around (or just sitting around in) various locations off the path. When straying off the path, the RAT will be your main obstacle. If you merely walk, then the RAT will not chase you, making the only threat accidentally stumbling into one; though if you walk in front of one's face, you are as good as dead, even if you walk. If you sprint, the RAT will chase you until you go back on the path or until they catch you.
- Shadow RAT is one of the 2 FNaC 3 monsters to not appear in a trailer, demo or teaser, the other being Lollipop.
- Although Shadow Rat has no eyes, in the jumpscare it has phantom eyes, similar to the Phantom Animatronics from Five Nights at Freddy's 3.
- Shadow Rat's animations in the bedroom is the same as the ones of Monster Rat.
- After the third game's release, Emil Macko says that Shadow RAT is the RAT himself, haunting Mary's nightmares in a noncorporeal form, much like Shadow Candy.