About the Game
Thank you for over 500,000 copies sold!
Half a million players have stepped into the radioactive ruins, scavenged for precious loot, and fought tooth and nail to make it out alive. That number represents not just sales, but stories. Thousands of extraction runs, loadouts tested, factions faced, and unforgettable moments of survival and chaos.
For those who are making runs into the radioactive wasteland, THANK YOU! And for those of you thinking if you should join them, well, I know 500,000 reasons why you should...
Happy hunting...
The world has ended. ZERO Sievert charges you with scavenging equipment across multiple areas, all set in an atmospheric fictitious post-apocalyptic Eastern Europe setting. Your base of operations, the bunker, is filled with traders, modding stations, and areas to make your own, providing you with progression across your excursions into the wild.
Once you’re out in the wilds of the wasteland, however, the situation becomes a lot less secure. Across the six biomes of the game, you’ll initially be armed with little more than a gun and a bottle of water, after which point it’s up to you to recover items, take out bandits, and most importantly, get back alive.
And be warned; the nuclear fallout may have impacted some of the local wildlife…
Learn To Survive, Fast
With a complete new hunter experience, our tutorial takes you (loosely) by the hand and equips you with the knowledge, skills and guns you'll need to to survive and thrive in the world of ZERO Sievert.
A Wasteland to Explore
Procedurally generated maps make every journey different, with ever-changing hiding spots, loot locations, weather, and layouts. With six maps to explore, be sure to adapt and learn each one's secrets to get in, get out, and get better.
Full Weapon Modification
Hunt in a way that suits your playstyle, with over 50 unique guns and 150 mods that can be combined to make you the biggest threat in the wastes of ZERO Sievert. Create a weapon that suits your style or focus on stats to become the ultimate hunter.
Maximise Your Gear and Skills
As you survive the harsh wasteland you’ll gain experience, sharpening your skills and unlocking new ways to become a deadly hunter. The Weapon Skill System allows you to level up various weapon types, boosting stats such as reload speed, damage, movement speed, and even unlocking unique perks tailored to each weapon. Beyond weapon XP, you can level-up your hunter with unique perks to help navigate the wasteland, tackle tough challenges, and take on more enemies.
Choose your Faction
In Zakov you’ll encounter The Green Army, a group dedicated to maintaining law and order, or the Crimson Corporation, a global pharmaceutical and technology giant. As a hunter you can choose a faction, earn reputation, unlock unique faction quests, and collect special, high-tier loot to aid you in your journey throughout the wasteland!
Looting and Questing
Multiple questlines guide you through the world of ZERO Sievert. Through talking with a range of characters you’ll slowly unravel information and lore about the world that’s been left behind. Alongside this, there are more than 100 different items to loot which can be used to craft new items, upgrade your own base, and trade.
Modding & Steam Workshop
The Steam Workshop offers all new ways for you to experience the post-apocalyptic world of Zakov. Dive into a wide range of game changing mods that introduce new weapons to your arsenal, factions for you to work for, NPC’s to discover, quests, languages, and much more.
Screenshots
6 images
Version Information
Steam Patch Notes
Official update history
Hunters, The Phantom Update is now live!
This update brings a mix of new threats, new content and quality of life improvements to the Bunker and Zone. From a new roaming danger in the Swamp, to expanded storage systems that make your stash more organised and easier to manage, there's plenty to discover both in and out of raids.
Stay sharp! This update changes more than it seems...
New Boss: Phantom
Something is moving in the Swamp… and it doesn't stay still for long...
We've added a new roaming boss to put you even more on edge when trying to find and secure your loot. Not only that, but he's rocking a ghillie suit to make him just as much an unseen threat as he is a formidable enemy.
Should you track him down and come out of the battle victorious, you'll find coordinates on your map leading to his secret stash, which has some epic gear inside. Just make sure he doesn't find you first...
Added a new roaming boss to Swamp called Phantom.
Phantom actively patrols the map, similar to Arman, so you'll need to stay alert at all times.
Phantom is equipped with a unique loadout, including a Ghillie Suit armor designed for maximum concealment, and custom ghillie modifications for his N1o, enhancing stealth gameplay.
Once killed, Phantom drops Coordinates revealing a hidden chest location directly on your map.
New Containers
The long awaited Stash containers are finally here! And it's not just ammo that's getting the upgrade...
We saw your feedback and couldn't agree more that expanding the system beyond improving ammo storage was a must, so now you can also stack your scrap to your hearts content (as long as your hearts content is equal to or less than 99,999 per container...).
Containers cannot be taken into raids to keep them as a purely bunker-focused storage solution, but items stored inside containers still count towards quests, crafting and repairs, and they will be automatically consumed when used in these systems.
Added containers to support a variety of items, including: all types of ammo, Scrap Ammo, Scrap Armor, Scrap Food, Scrap Material, Scrap Meds, and Scrap Weapon.
Each container can hold up to 99,999 of a single item, allowing for large-scale resource management.
To craft a container, head to your Crafting Bench in the Bunker and select the new 'Containers' option.
For easier crafting, tick the "Track" option for the Container you want to craft. This helps you know how many materials you need when out in the field.
Bunker Radio
To help make the Bunker feel that little bit more homely, we've added an array of speakers throughout, along with a radio in the bar to control them.
To use the radio, you need to complete the new quest "Get Some Music" given by the Barman. This opens up a new area in Forest with a little surprise inside... Once complete, you can be the DJ in your own post-apocalyptic hellscape.
Music tracks are both found around the Zone and unlocked when completing specific quests. There's eight different tracks currently available with more coming in future updates.
Added a new quest "Get Some Music", given by the Barman after completing "Towards Makeshift Camp".
Completing this quest unlocks the brand new Bunker Radio feature.
Added a Bunker Radio and speakers which allow you to find and play music tracks in the Bunker.
Train Skins
Now you can choo-choo-choose your favorite skin for your favorite locomotive!
It was about time the train got some love. After all, it's what takes to your hunting grounds which leads to your success or your demise... Either way, now you can show your progress with a load of new visual unlocks, making your trip to the Zone that little bit more your own.
So you can enjoy the train skin goodness across all of your saves, skins are unlocked at the account level and not per save. Hunters who have already completed these requirements will instantly unlock all relevant skins.
Added a new train skin system, used by talking to the Conductor.
6 new train skins available, each tied to specific achievements and progression paths:
Green Army - Join the Green Army.
Crimson Corporation - Join the Crimson Corporation.
Scientist - Reach 450+ reputation.
Watcher - Complete the quest "The Crystal".
End Game - Finish the game with any ending.
Anomaly - Complete the game via the secret ending.
New Achievements
There's even more to chase in the Zone with 20 new achievements added in this update!
Whether you're a completionist hunting every last challenge or simply playing through the new content, keep an eye on your achievement list as you might be closer to unlocking something than you think.
New Daily Quests
The Networker has a new selection of tasks to give! Over 50 new mission objectives have been added to the Networker's pool of repeatable daily quests, giving you more variety and more reasons to head back into the Zone each day. Whether you're hunting specific targets, gathering resources, or pushing deeper into dangerous territory, there's always a fresh contract waiting
Bug Fixes & Quality of Life
Improved image quality - fixed pixel shimmering.
Fixed an issue where certain quest items would fail to spawn.
End of Transmission
So, The Phantom Update is here!
New threats roam the Zone. New systems help manage your gear. And the Bunker is now more homely than ever before.
Whether you're tracking Phantom through the Swamp, uncovering hidden stashes, fine-tuning your loadout, or simply bringing a bit of life back to your bunker with music, this update is about giving you more control, more clarity, and more ways to survive.
Stay prepared, Hunters.
Oops! 😓 We made a mistake with the previous build, and we’re really sorry if you were affected by the crash.
The team worked quickly to get a hotfix out, and this should now be fixed.
Patch Notes
Fixed a crash on death.
Really sorry about that! We were so excited to share the Controller Improvements and ✨Borderless Fullscreen✨, but we should have left this one cooking in beta for a little longer.
Hello Hunters!
We just published another hotfix, this one includes some important quality of life updates:
Bug fixes
Borderless fullscreen is now available: Hopefully this means less issues with alt-tabbing and gpu drivers, it's enabled by default on fresh installations but you may want to turn it on if you have existing settings. If you are one of the users experiencing issues with alt tabbing the game go and turn Borderless mode ON, tell us here in the comments or on Discord if this solved your issues.
Fixed several potential crashes
Improved gamepad controls and UI navigation
Map markers can be placed and removed with just one button on controllers
Map navigation now uses analog stick instead of dpad on controllers
Improved gamepad aim assist
Steamdeck glyphs: steam deck users will now see console-correct images on button prompt, before the graphics were shared with the xbox pad
Inventory: Better handling of item dragging with controller
Radial menu on controllers swapped from right to left stick
and many other minor fixes!
Hello Hunters!
We've just put live a hotfix which has a speculative fix for the crashes some of you have been experiencing. This one has been particularly difficult to reproduce, so as a starting point for tackling it, we've updated the Steam SDK which was.... just a few versions out of date...
Update, jump in and let us know how it looks and feels. and most importantly...
If you had the crash and it's fixed, let us know. And if you had the crash and it isn't fixed, let us know!
Let us know in the comments or join the official ZERO Sievert Discord server and give @Ethan a shout and give him an update on the update.
Any and all information you can provide to us will help us get closer to resolving this problem.
Thank you!
We'll see you in the Zone...
🎄 ZERO Sievert Christmas Update Is Live!
The Christmas Event is back in ZERO Sievert!
Jump into the Zone during the holidays to hunt for festive loot, upgraded airdrops, and new backpacks including drops from NPCs for the first time ever.
🎒 NPCs now drop backpacks
🎁 9 brand-new backpacks added
🎄 Christmas airdrops guaranteed festive gear
Good luck out there, and get Santa some milk!
🎄 Christmas Event Returns
The holidays have arrived in the Zone once again.
The Christmas Event is now enabled, bringing back festive loot and themed encounters.
If you extract alive while carrying a Christmas Event item, it will be automatically added to your stash when starting a new game.
Limit: 1 per unique item, except grenades (up to 5).
Christmas Airdrops have been improved:
Now have a 100% chance to spawn at least one piece of Christmas equipment.
Will never spawn in the Horizon area on the Industrial map, ensuring better access and fairer risk.
Santa Claus has upgraded his loadout and now carries a Christmas Backpack — keep an eye out.
🎒 Backpacks & Loot Changes
One of the most requested features is finally here.
NPCs now drop their backpacks when defeated, allowing players to loot them directly.
Added 9 new backpacks, expanding storage options and loot variety.
Added custom spawn chance settings for backpacks, giving players more control over balance and progression.
⚙️ Quality of Life & Settings
Several improvements based directly on player feedback:
Added a setting to toggle the ammunition icon introduced in the last update.
You can now uninstall and reinstall modules without crafting a base module kit again, making experimentation and loadout changes far less punishing.
That's it for this one! Thank you again for all of your feedback, ideas and carnage Hunters!
Merry Christmas from all of us here at ZERO Sievert
Current Release
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Uploaded Apr 03, 2026
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System Requirements
How to Install
ZERO Sievert.exe to play
Troubleshooting tips
• Run Redist/_CommonRedist installers if game won't start
• Add folder to Windows Defender exclusions
• Run as administrator
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213 MB
22069566
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