Screenshots
Watch trailer on Steam ↗Toxoplasma
SimmeringConcrete · Published by SimmeringConcrete
Last updated 28 Sept 2026
You are trapped on an abandoned space station, developing a bio-weapon that makes the infected hallucinate demonic entities. Spot any anomalous signs of infection before they kill you, complete your research, and unmask the conspiracy that brought you here.
Adventure, Indie, Simulation · 2026 · More free games
Explore and survive on an abandoned space station as you develop a bio-weapon that drives infected crewmates to madness. Uncover the hidden conspiracy that led to your isolation, all while staying one step ahead of the demonic hallucinations.
About this game
█ Toxoplasma is a First Person Sci-Fi Horror game set on an abandoned space station where you're developing a bio-weapon designed to end humanity.
█ DETECT ANOMALIES: Identify anomalies before your hallucinations become fatal.
█ DEVELOP: Progress your bio-weapon research.
█ SURVIVE: Distinguish reality from demonic hallucinations.
█ UNCOVER: Piece together the conspiracy behind your mission through scattered evidence and radio transmissions.
█ DECIDE: Your choices shape multiple endings, including a hidden ending.
█ The infection manifests differently each playthrough. No two experiences are identical, ensuring a terrifying experience for newcomers and veterans.
STORY
The world is falling apart. A rise of violence and misanthropy ravages the Earth, but your space station is not safe either. Every day you work towards a bio-weapon made to wipe out humanity in the most brutal way possible. Anyone who is contaminated hallucinates demonic entities that torment them until they die. You must complete its development before your hallucinations kill you. You must figure out why you are trapped here.
System Requirements
Will my PC run this? →Minimum
- OS: Windows 10 64-bit
- Processor: Intel i5 or AMD Ryzen 5 from around 2016 or later
- Memory: 4 GB RAM
- Graphics: DirectX 11 Feature Level AMD or NVIDIA Card with 1 GB VRAM
- DirectX: Version 11
- Storage: 2 GB available space
Recommended
- OS: Windows 10 / 11 (64-bit)
- Processor: Intel i5 or AMD Ryzen 7 from around 2018 or later
- Memory: 8 GB RAM
- Graphics: DirectX 12 Feature Level AMD or NVIDIA Card with 4 GB VRAM
- DirectX: Version 12
- Storage: 2 GB available space
Supported Languages
*languages with full audio support
Latest news
AnnouncementsOfficial
Toxoplasma Demo Release Date!
Hey everyone!We're proud to say that the demo is ready to be released on April 9th, and that our trailer was featured on the IGN channel! Thank you all for your support and we hope you're as excited as we are for you to finally experience Toxoplasma!Read full article on Community Announcements (SimmeringConcrete)AnnouncementsOfficial
Sound Design Devlog
A big part of horror is the sound design, which is why I've spent a lot of time studying other games sounds and their intention, as well as making a comprehensive sound system in the game engine to cover all cases needed for Toxoplasma. Of course, I can't tell you the systems secrets as that would be a spoiler of what's to come. During my playthroughs of Alien Isolation and ROUTINE, space horror games with amazing sound design, I wrote down pages and pages of notes and breakdowns. Analysis on how the sounds act individually and as a group, a breakdown of how (I think) the developers made each sound feel real and not as if it were a sound file being looped over and over. This led Toxoplasma having, according to my private play-testers, a very atmospheric soundscape. There's still more I want to do in this regard though. I've set a strong foundation for the sound design which could be shipped as-is, but I truly want to emulate the same feeling of the other space horror games, games with masterful sound design and atmosphere.Thank you all for sticking along for the ride. As a little spoiler for those who read this devlog, a public playtest will be coming within the next few months 😉.Read full article on Community Announcements (SimmeringConcrete)AnnouncementsOfficial
Environments: The Vents
Environments: The VentsAs you progress through the story of Toxoplasma, you will encounter situations where the only "safe" escape is through the vents. What will be a surprise, however, is that the layout of the vents will change every time you enter them. This means that your last safe trek through the vents is no guarantee that you will stay in one piece the next time you go through.Read full article on Community Announcements (SimmeringConcrete)AnnouncementsOfficial
Toxoplasma Announcement!
What happens when the weapon you're creating consumes you?We are very proud to announce Toxoplasma! Right out of the gate, I want to say that a demo is already in development, with a definite direction already planned out for the timeline and storyline of the game. I will also be posting monthly updates about some features and environments of the game, with the next one being The Vents. Stay tuned, and follow to keep up-to-date!Read full article on Community Announcements (SimmeringConcrete)
