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New update for Android FNaF 1 is being pushed today!
https://play.google.com/store/apps/details?id=com.scottgames.fivenightsatfreddys&hl=en_US
"Rated E", FNaF 1-3 are all rated "T" and for a short period of time 4 was rated "M" but was re-rated by the ESRB later to "T".
EDIT: Sauce
FNaF has been released both on Desktop through Steam, and on mobile devices through multiple App Stores. The console versions are being worked on, but they haven't been released yet. I don't know which mobile device you own, but I'll link to the Steam and Android versions of the games.
Five Nights at Freddy's:
Steam: https://store.steampowered.com/app/319510/Five_Nights_at_Freddys/
Android: https://play.google.com/store/apps/details?id=com.scottgames.fivenightsatfreddys
Five Nights at Freddy's 2:
Steam: https://store.steampowered.com/app/332800/Five_Nights_at_Freddys_2/
Android: https://play.google.com/store/apps/details?id=com.scottgames.fnaf2
Five Nights at Freddy's 3:
Steam: https://store.steampowered.com/app/354140/Five_Nights_at_Freddys_3/
Android: https://play.google.com/store/apps/details?id=com.scottgames.fnaf3
Five Nights at Freddy's 4:
Steam: https://store.steampowered.com/app/388090/Five_Nights_at_Freddys_4/
Android: https://play.google.com/store/apps/details?id=com.scottgames.fnaf4
Five Nights at Freddy's: Sister Location:
Steam: https://store.steampowered.com/app/506610/Five_Nights_at_Freddys_Sister_Location/
Android: https://play.google.com/store/apps/details?id=com.scottgames.sisterlocation
Freddy Fazbear's Pizzeria Simulator:
Steam: https://store.steampowered.com/app/738060/Freddy_Fazbears_Pizzeria_Simulator/
Android: https://play.google.com/store/apps/details?id=com.clickteam.freddyfazbearspizzeriasimulator
Ultimate Custom Night:
Steam: https://store.steampowered.com/app/871720/Ultimate_Custom_Night/
Android: This game wasn't released on mobile devices.
Five Nights at Freddy's VR: Help Wanted:
Steam: https://store.steampowered.com/app/732690/FIVE_NIGHTS_AT_FREDDYS_VR_HELP_WANTED/
Android: This game isn't available for mobile devices.
The last game (Help Wanted) needs a VR compatible device to play, and those can get quite expensive. Pizzeria Simulator and Ultimate Custom Night are free on Steam, and you can buy the first five games as a bundle on Steam on this link: https://store.steampowered.com/bundle/1729/FNaF_Franchise_Bundle/
All I could think of was "Five Nights At Freddy's" when I first saw it.
https://play.google.com/store/apps/details?id=com.scottgames.fivenightsatfreddys&hl=en_US Does this say it's not found for anyone else?