The Backrooms Update — 1.3.0

A community-feedback update — multiplayer is fixed, it plays nicely with other world-generation mods, and there are new ways for The Complex to get under your skin.

Added

The way home isn't guaranteed — crossing into The Complex now has a chance to build your return portal blown apart. You land safe beside it, but you'll have to repair or rebuild to leave. The chance scales with difficulty (rare on Easy, ~1-in-4 on Normal, ~2-in-5 on Hard).

Difficulty-scaled loot — Easy keeps a full pantry and escape gear is common; Normal is unchanged; Hard is genuinely barren (fewer chests, thin food, scarce gear, some turn up empty).

Shifting walls — very rarely, leave a part of The Complex and come back and its interior has quietly rearranged itself. Never while you're watching, never touches your builds or the landmarks, at most once a day per area — just often enough to make you doubt your map.

Changed

Still Lifes come apart a piece at a time — instead of one hit dropping a single stew, each punch or right-click now tears off a limb (a bowl of mushroom stew each, and the body shrinks) until there's nothing left and it collapses. Direct hits only — no farming them from range.

Fixed

Multiplayer portal crash — crossing a portal while another player was on the server could crash it (or freeze the world). Co-op portals work now.

"Falling into the void forever" with terrain mods — The Complex no longer breaks with Tectonic, Continents, Deeper Oceans. If it ever still fails to load right, it sends you back to the overworld with a warning instead of dropping you into an endless void.

Sable compatibility — The Backrooms now coexists with Sable.

Per-player memory leak on long-running servers (crossing/insanity state is cleared on logout).

Notes

The multiplayer, terrain-mod (Tectonic / Continents / Deeper Oceans) and Sable fixes were all tested directly. The terrain-mod fix applies to newly generated Complex chunks, so start a new world or explore fresh area for it.

Join the Discord for bug reports & mod-compatibility help: https://discord.gg/6QV5kEw5R

Requires NeoForge for MC 1.21.1 (Java 21). Start a new world for the best experience.