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Apollyon

Demo available

Fifth Floor InteractiveDiscovered Sep 29, 2026

About the game

1979. P.L.U.T.O keeps sending your team of researchers back through G.A.T.E into the backrooms for deeper expeditions, but they are never happy with the lengths you go to. Nearest exit gets your team back safe. Only the deepest exit will suffice.

Original Steam description

Lead a team of up to six P.L.U.T.O. surveyors through G.A.T.E, a portal to the Backrooms created in 1979. Explore hand built rooms stitched together differently each run, stay close enough that your senses stay honest, and push further than the last expedition made it. Stay together. Trust no one.

P.L.U.T.O RESEARCH DIVISION, 1979

G.A.T.E was supposed to be studied, not entered. It was entered anyway.

Your team pushed through into somewhere that does not follow the layout it was built on. Corridors repeat. Rooms exist that weren't in the last briefing. They want you to explore deeper than the last expedition even though you barely made it back.

TRUST NO ONE

Somewhere below G.A.T.E, something learned to sound like one of you. Move like one of you.

It walks like the person it copied. It behaves like the person it copied. It responds like the person it copied. It doesn't strike when the group’s scared or falling apart. It strikes once everyone's stopped counting.

You won’t even notice when someone's missing, you've already been standing next to the thing that took them.

DON'T SPLIT UP

Company keeps you sane. 

Fall behind, get separated, or push ahead alone, and your own mind starts working against you. Darkness closing in. Movement at the edge of your vision that isn't there. Voices coming from the walls.

The longer you wander alone, the less you can trust your own senses.

A PLACE THAT DOES NOT ADD UP

Doors open up to rooms that can’t fit behind them. Spaces connect in ways they shouldn’t, and down isn't always down.

There are no loading screens. You just notice, eventually, that you have gone deeper.

WHAT ELSE IS DOWN THERE

Some things only move when no one is watching. Others stalk you from the cover of darkness or crawl overhead. 

All of them are listening. The walls only muffle so much.

FEATURES

Online co-op for up to 6 players through friends-only Steam lobbies.

Proximity voice chat, muffled through walls.

Monsters that hunt through sound, sight, and smell.

Hand-built rooms, stitched together procedurally each run.

Seamless level transitions.

PSX-style models with better lighting.

No LLM's. Not even the mimic.

THE LOOK & OPTIMIZATION

Low-poly PSX style geometry and low-resolution textures, lit by lighting the old games couldn't. Optimization has taken the main stage with the most usage being offloaded onto the Host which should be the person with the best computer.

HOW FAR DO YOU PUSH IT

Your team has the option to take earlier exits back. That's not what P.L.U.T.O’s goal is. They want you to take the last exit but other exits aren’t in vain.

Demo and release information

A Steam demo was found at the latest check. Confirm it is still available in your region on Steam before downloading.

Steam demo, playtest and Early Access: what is the difference?

Information & artwork: Steam · Last checked UTC