Here's how players can escape the Doctor's trap of filling the prison with the red toxic gas which can become fatal in Poppy Playtime Chapter 4.

Here's how players can solve the door shutter puzzle so they can activate the blue and the red scanner at the same time in Poppy Playtime Chapter 4.

Here is our rundown of Poppy Playtime: Chapter 4; its story and ending explained. Warning for spoilers throughout.