Getting out of the many confusing rooms in Poppy Playtime's Chapter 3 can be tough, and you won't be able to do it without grabbing the Gas Mask at some point during your playthrough. The Gas Mask makes you immune to the toxic gas emitted by some characters. Here's how to escape Huggy Wuggy and get the Gas Mask in Poppy Playtime Chapter 3.
How To Get The Gas Mask In Poppy Playtime Chapter 3
Once you escape the Warehouse, you'll find yourself in a house with a video tape. After you watch the video tape, you'll have to get past the cutscene where Huggy Wuggy chases you down the hall. There's nothing you can do here; you'll just have to watch as he chases you, and then you'll pass out. Don't worry - you can still progress with the story, and this doesn't count as a death, since it's scripted.
Once the scene with Huggy Wuggy is over, you'll end up in a building with lots of items inside, including cardboard cutouts with big buttons that say "Press Here." Do that, making sure you find them all. There is a cardboard cutout for every Poppy Playtime character in the intro movie, so you may need to look around to find each one.
Once you've succesfully pressed all the buttons and found all of the cardboard cutouts, you'll find a little opening that will take you into a somewhat underground hole.
In it, you can find the Gas Mask hanging off of the wood. Be sure to pick it up and put it on, since you're going to need it. The Gas Mask protects you against the toxic gas that some characters emit, and is crucial to getting past certain areas of the game.