Poppy Playtime Chapter 4 provided answers, but also sparked even more questions. This explanation untangles the complex web of grudges and ambitions in the game's convoluted ending.
What Does the Poppy Playtime Chapter 4 Ending Mean?

Poppy Playtime Chapter 4 is a rollercoaster of emotions. While Safe Haven initially offers a sense of security, this is short-lived. Despite defeating Yarnaby and the Doctor, our heroes face new challenges.
The Prototype learns of Poppy's explosive plan and moves them, triggering a catastrophe that shatters Doey, turning him aggressive. After defeating him, we encounter the hiding Poppy and Kissy Missy.
Here’s the major twist: Ollie, our supposed ally, is revealed to be The Prototype. This villain's chilling appearance is matched by his ability to mimic voices and deceive. He uses this ability to manipulate Poppy, pretending to be Ollie.
A VHS tape found during the chase with Doey reveals a previously unknown meeting between Poppy and The Prototype. Poppy is shown crying after a moment of joy, revealing The Prototype convinced her they could escape the factory—a promise ultimately broken.
The Prototype argues escape is impossible, as they've been transformed into monsters and are unacceptable to humans. Despite her hatred of the factory, Poppy understands and agrees to his plan to destroy it, preventing more victims.
However, The Prototype anticipates Poppy's plan, using his guise as Ollie to thwart her and threaten to imprison her again. His motives remain unclear, but the threat forces Poppy's desperate flight.
What's the Deal With the Laboratory in Poppy Playtime: Chapter 4?

Poppy's departure leads The Prototype to attack the player's hideout. Despite Kissy Missy's attempt to stop us, her damaged arm fails, leaving us vulnerable but alive, and ultimately in the lab. This lab, a garden of poppy flowers, reveals the factory's experimental origins.
This area is likely the final location in the Poppy Playtime series. Poppy previously indicated it holds The Prototype and the orphaned children. The final confrontation likely involves rescuing the children and destroying the factory, but navigating the lab's security and facing a wounded but still dangerous Huggy Wuggy (possibly the same one from Chapter 1) will prove challenging.
This summarizes the ending of Poppy Playtime Chapter 4. The climax approaches, requiring the defeat of the final boss to escape this nightmarish factory.
Poppy Playtime: Chapter 4 is available now.