Game: Five Nights at Freddy's (2014), by Scott Cawthon
Platforms: Android and PC
Size of the job: five nights, midnight to 6 AM
Controls: touch or mouse - cameras, two doors, two lights
No install needed? the browser version is on the FNAF 1 page
Five Nights at Freddy's is the game that started the whole series, and it still scares a lot of people. It came out for PC first and then arrived on Android. You play the night guard at Freddy Fazbear's Pizza. The toy animals entertain children during the day, and at night they get out and come for you. You sit in your office watching the building on the security cameras. All you have to do is last five nights, get paid, and survive.
Before you install
The download link goes to the official store listing, not a mirror
The mobile version keeps everything from the PC release, including night 6 and the custom night
Controls are touch-based, so the two doors sit at the screen edges
The whole game is offline - nothing needs a connection once it is installed