About the Game

INFERNO PROTOCOL is a co-op survival horror set in a maze that does not stay still. There is no map you can trust. No corridor you can return to the way you came. You'll mark the walls, harvest the things that hunt you, and inject yourself with things that may save you or rewrite you. Solo or up to 6 players. Somewhere in here, there's a way out.

The maze does not stay still. The corridor you came from won't be the corridor you go back through.
Spray the walls. Drop chalk. Leave objects behind. Find old hand-drawn paper maps and figure out which ones are lying. A compass helps, until it doesn't. Remember: Memory is your map. Marks are your guide.

The maze keeps changing. Corridors give way to forests, deserts, frozen halls, places that shouldn't be underground.
Others walked here before you. Notes, scratched-out warnings, sketches on the walls, most of it panic, some of it useful. A few point to injectors. A few point to exits. A few point to things you shouldn't go near. Whoever left them isn't around to ask.

People live in here. Not many.
There's a settlement at the center where you can farm, build walls, and craft what you need. Outside it, smaller camps survive in the corridors. Some will talk, some will trade, some won't wait for you to draw first.
The rules of the maze cost more than ammo.

Resources are scarce. Scrap metal and frayed wires will only get you so far. When you take down a creature, harvest what remains, bones, armor, flesh, organs. It's grim work, and the maze doesn't care.

Find traps or craft your own. Plant them in the corridors, back off, and let the maze do the rest.

You will find injectors. The deeper you go, the more you'll need them. Some are labeled: dash, rage,
night vision, double jump, extra health. Others aren't labeled at all, and you'll use those too, sooner or later.
Screenshots
15 imagesVersion Information
Steam Patch Notes
Official update history
- Signs added, you can now place signs.
- Thrown items and shot arrows now travel more smoothly.
- New crosshair added for the Crossbow.
- Some trader items now have stock limits and only restock at set times.
- Fixed Crossbow arrows sometimes appearing to come from the wrong side of the screen.
- Fixed a bug where players joining late could get stuck due to a bad timeout flag.
- Fixed the Blowgun dart not being craftable.
- Fixed clients far from the lobby host being unable to break items with arrows.
- Fixed players clipping into objects when the maze finished rotating.
- Fixed items not syncing properly with the rotating maze.
- Fixed item-giving NPCs sometimes playing a walking animation while standing still.
- Fixed the Machete dealing no damage on throw.
- Fixed the delay issue in voice chat.
- Optimized voice chat on the server side.
- The default push-to-talk key in voice chat is now X. (It was previously J, which conflicted with the Monster Scream skill.)
- Fixed an issue where you would sometimes stay in the game even after losing connection.
- Fixed texture issues on NPCs.
- Improved the censorship on characters.
- Fixed an issue that prevented players joining as clients from farming.
- Improved the filter icon in the Craft and Build UI.
- Fixed localization issues in the Notepad.
- Thrown arrows and melee weapons now properly align with enemy hitboxes.
- You can now drop your bandage for a teammate while injured/downed using the 'G' / 'D-Pad Down' key.
- Added a "Toggled Run" option to Gameplay settings. You no longer have to hold the sprint key.
- Improved the gas mask overlay.
- Fixed monsters occasionally spawning inside walls on Layers 2 and 3.
- Fixed injured/downed players being able to walk while entering/exiting water.
- Fixed injured/downed players getting permanently stuck in ragdoll state.
- Fixed unbalanced creature spawn rates on Layer 1.
- Fixed the exit from the Swamp layer.
- Fixed a loot issue in the Swamp layer.
- Fixed issues occurring at the Cave interior exit.
- Improved gamepad input icons.
- Fixed UI issues with the Worm Teleporter.
- Fixed an issue where injecting a friend wouldn't give them an empty injector.
- Fixed object & collision issues in the Junkyard layer.
- Fixed an issue where friends' save data was lost when saving in singleplayer after playing and saving together in multiplayer.
- Fixed a UI bug that occurred when crafting item quantities exceeded 255.
- Fixed lighting issues with the Wall Torch.
- Fixed a bug where players were teleported into the clouds when exiting a cave.
- Fixed an issue where players could fall through the floor in an interior area.
- Fixed an issue where the character became controllable while adjusting control settings during gameplay.
- Fixed an issue in solo mode where hunger and thirst continued to increase while the game was paused.
- Ores produced by the Smelter now stack properly.
- Fixed an issue where lobbies created by players in distant regions were not visible.
- Fixed an issue where the Worm Teleporter detached from the maze floor and drifted away on its own.
- Fixed an issue where the maze continued to rotate even after turning off its power source.
- Consuming canned drinks now grants a Metal Scrap item.
- Fixed minor localization errors.
- Fixed an issue where certain items were missing from the crafting list.
- Players who joined the lobby later were having trouble using the crossbow. Fixed.
- Added an option to disable input delay: Settings → Controls → Look Input Smoothing.
- Bronze item blueprints were not unlocking properly. Fixed.
- Some structures were displaying with incorrect orientations. Fixed.
- Fixed the localization for Corn Seeds.
We just pushed a hotfix update. Here's what's new:
Fixed an issue where Wooden and Stone arrows couldn't be crafted
Fixed voice lines for several NPCs
Rebalanced loot
Fixed sound issues in the new sewer interior
Rebalanced creature spawns
Fixed an issue where players other than the lobby leader couldn't take items from NPCs in friend lobbies
Fixed NPCs talking too fast
Fixed missing sound effects on teleport traps
Fixed an issue where entering interiors would sometimes immediately kick you back outside
Fixed the glass piece in the Prologue not being added to your inventory when picked up
Added a message that now appears when heading to the maze gate at night from the safe zone, warning that the gates are closed and you need to sleep
Fixed the giant rat sometimes launching you underground
Our next update will focus on the caves found on Layer 2.Cheers!
Current Release
Build 25242802
Uploaded Sep 11, 2026
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System Requirements
How to Install
Inferno Protocol.exe to play
Troubleshooting tips
• Run Redist/_CommonRedist installers if game won't start
• Add folder to Windows Defender exclusions
• Run as administrator
Download
Direct link available
Needed when extracting (WinRAR / 7-Zip) — not a site login.
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View AllDownload Inferno Protocol for PC with a direct link or via torrent. Get the full version of Inferno Protocol for free. Inferno Protocol is a Action released by Tektonic Interactive.