A bug once allowed players to unlock the hardest mode instantly by pressing "2" and "0" at the same time in the menu.
On Night 5 or during the 20/20/20/20 challenge, animatronics like Nightmare Bonnie and Nightmare Chica are supposed to be "force-teleported" away when Nightmare Fredbear or Nightmare arrive. However, a known bug can cause players to still die to the original animatronics shortly after 4 AM if the "swap" doesn't execute perfectly. Five Nights at Freddy's 4 баги
By manipulating game files (changing the save data to indicate "night n"), players can access a hidden "Night 9". Much like the glitches in FNaF 1 and 2, this night typically features no animatronic activity, allowing for a peaceful exploration of the environment. A bug once allowed players to unlock the
Occasionally, Nightmare Bonnie or Nightmare Chica can jumpscare the player even after the clock hits 6 AM if their attack animation was triggered at the exact same millisecond as the night's end. By manipulating game files (changing the save data
Players have reported that audio can occasionally cut out during the 8-bit minigames between nights. This is widely considered an oversight in the game's coding that was never fully patched. Gameplay & AI Oddities
If you unlock the "House Map" cheat, you’ll notice that Nightmare Freddy never appears on the radar. This is likely because his model only "spawns" into the room when he is performing a jumpscare, rather than moving through the halls like the others. Fixed Historical Bugs
In the very first release, pressing the "=" key allowed players to instantly skip a night. This was removed in a hotfix just 15 minutes later.