Three night at cinema

You or your friends will have to work at a cinema make sure you check the people ID because there are Dopplergangers which one to eat you if let in two you are dead if you see one you will have to call 121 and there be people taking the Dopplergangers away. You will have to survive 3 nights each night is 10 minutes long. You will have clean the cinema.you can upgrade to help you and there is a book where there are rare Dopplergangers