The Custom Night allows you to tailor the difficulty to your liking. Experiment with different animatronic combinations and AI levels to practice specific threats or create unique challenges. For example, you could set only the Withered animatronics to high AI to practice dealing with them exclusively. Or, you could create a 'No Foxy' challenge by setting his AI to 0. This is an excellent way to improve your skills before attempting 5/20 Mode. Pay attention to how different animatronics interact and how their AI levels affect their movement patterns and aggression. Use this mode to refine your timing, mask usage, and flashlight conservation. It's a sandbox for mastering the game's mechanics.
