Five Nights at Freddy's offers a straightforward progression through its nights, but there are a few unlockables and a bonus mode for those who conquer the main challenge.
Main Game Progression:
The game consists of five main nights, each progressively more difficult as animatronics become more active and aggressive. Surviving each night unlocks the next.
Unlockables:
- Night 6: Successfully completing Night 5 unlocks Night 6, which significantly ramps up the difficulty.
- Custom Night: After completing Night 6, you unlock the Custom Night. This allows you to set the AI aggression level (from 0 to 20) for each of the four main animatronics individually. This is where the true challenge and replayability lie.
- 4/20 Mode: A special preset within Custom Night where all animatronics are set to an aggression level of 20. This is considered the ultimate challenge in the game.
There are no other major unlockables or character customizations in the original FNAF, but the Custom Night provides endless replayability for those seeking to test their skills.