Escape the Backrooms has opened Level 421, also known as Plastic Mariana, across all platforms. The new area takes Wanderers through an abandoned MEG base connected to a children’s hospital before leading them into Bruce’s Discovery Center and a dark ball pit.
The launch follows our earlier Level 421 announcement, which identified August 27, 2026 as the arrival date. The developer confirmed that the update is now available in its Steam announcement.
Plastic Mariana drops players into the darkness
Plastic Mariana has a wonderfully strange setup, at least by Backrooms standards. The level joins a deserted MEG facility to a children’s hospital, then sends players toward Bruce’s Discovery Center. A no-clip zone eventually drops them into the darkness beneath a ball pit.
There is no quiet ending waiting down there, either. The developer warns that players are not alone, leaving groups to work out who is a friend and who is a foe. Alongside Level 421, the update adds 2 new entities and an entity variant.
Several multiplayer fixes arrive with the new level. Lobby codes now work properly across platforms, while problems involving private-lobby access, late-joining players, and crashes on PS5 have also been addressed. Switch 2 receives multiple fixes for joining sessions and controller input, and Xbox players can once again interact with the Arcade Machine needed for the Arcade ending.
Here is the complete changelog for the update.
Escape the Backrooms Patch Notes
The main addition is Level 421 and its new entities. The remaining changes focus on lobby connections, soft locks, crashes, level geometry, progression routes, and menu controls across the supported platforms.
New Content
- Added Level 421 (Plastic Mariana), alongside two new entities and an entity variant.
Multiplayer & Networking
- Fixed a soft lock that could occur when repeatedly pressing the confirm button while joining a lobby on Switch 2.
- Fixed a soft lock that could occur when joining a Steam-hosted lobby on Switch 2.
- Fixed an issue where lobby codes were not working across platforms, which could cause friends to appear offline or fail to connect.
- Fixed a crash that occurred when creating a Story Mode or Hub lobby on PS5 while the console was in Offline Mode after a fresh boot.
- Fixed an issue on PS5 where blocking a player didn’t stop them from communicating with you in the lobby or during gameplay.
- Fixed an issue where the host instantly died on Hard difficulty if another player quits the session.
- Fixed a bug that lets players access private lobbies they hadn’t been invited to.
- Fixed an issue that caused players to fall through the world when joining a lobby with Level 188 already in progress, if the level was on the upper floor.
- Fixed the host not being able to see late-joining players in the top-left player list during gameplay.
Levels & World
- Fixed an issue where players could get out of bounds or temporarily soft-locked while interacting with the ladder in Level 37.2.
- Fixed an issue where players could get stuck behind the couch on the staircase in Thalassophobia.
- Fixed a soft lock caused by jumping onto a specific pole at the end of Thalassophobia.
- Fixed an issue where players were getting trapped inside the cage with the Fletcher in Darkened Suburbs.
- Fixed an issue where players were trapping themselves by infinitely “falling” into a bathtub in Darkened Suburbs.
- Fixed an issue where wooden crates became permanently stuck when pushed into certain corners of the first castle room in Level 94.
- Fixed a soft lock caused by jumping on a table in the first part of Terror Hotel.
- Fixed a soft lock that could occur when pressing “F” immediately after solving the padlock puzzle in Terror Hotel.
- [Xbox] Fixed an issue where Xbox players were unable to interact with the Arcade Machine, which blocked them from reaching the Arcade ending.
Controls & UI
- Fixed a soft lock caused by losing controller input in game menus on Switch 2.
- Fixed the cursor becoming invisible after returning from the Esc menu during a screen-click scene.
Plastic Mariana is waiting for anyone willing to fall into its suspiciously colorful ball pit. Share your thoughts on Level 421 in the comments, and follow us on X, Bluesky, YouTube, Instagram, Steam, and Telegram.
