To unlock the true ending, you must collect all 16 hidden "Glitchtrap plushies" scattered across every DLC level. Once collected, you access a secret level: the "Curse" room.
Beyond the scares, “Curse of Dreadbear” is essential lore. The base game introduced Glitchtrap (the digital clone of William Afton) trying to possess the player. The DLC delivers the horrific conclusion.
The DLC is available as a paid add-on for approximately . What LORE Is In FNAF Help Wanted? | FNAF Theory