Five Nights at Freddy's 3 is the third installment in the FNAF game series. You play as a security guard at Fazbear's Fright who must defend from an animatronic called Springtrap.
You must monitor two security cameras carefully to track the animatronic movements. Besides, you also need to watch the status of operating systems and try to keep them running. Otherwise, the cameras can become obscured and your vision begins to blackout. When Springtrap enters the building and jumpscares you, the game ends.
Just like other games, you need to survive five nights, increasing in difficulty. By completing five nights, you can unlock a Nightmare night. And it's much more challenging.