I don’t know how to play – Five Nights at Freddy's 3 Review

Can anybody explain how to play this game. I am a fan of fnaf 2 but this feels a lot different I am confused on what/who the anamactronics are or how to find them. I also don’t get the controls of the game and I don’t get why there aren’t lights to see in the vents or cams.
Review by clash of clans review on Five Nights at Freddy's 3.