Space Simulation Toolkit
Early access since Jun 2020
Physics sandbox game that uses a graphics card as a supercomputer. Change the laws of physics, design mechanisms, create A-Life worlds and inhabit them with living beings, experiment with evolution and AI.
80% positive · 538 reviews
Not yet
In early access, still in active development
High confidence
Active Development
Not yet
In early access, still in active development
High confidence
Active Development
Where to buy
Steam $17.49 $24.99 −30%
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Evaluation
Space Simulation Toolkit has been in Early Access since June 5, 2020 and remains under active development by solo developer Pavel Kudinov. The game's update history is extensive and consistent: across 48 total posts, 12 are major content releases, with additional feature patches and bug fixes filling the gaps between them.
The most recent major update, v0.10.0.0, shipped on June 5, 2026 — the game's 6th Early Access anniversary — introducing a new Biome simulation, DNA-based auto-growth structures, and other significant additions. Since then, the developer has continued posting: a feature patch on August 3, 2026 (drawing tools update) and another on August 7, 2026 (selection box, group editor, and reactions graph). The last communication is just 12 days before today's assessment date, making this one of the most actively communicating developers in the dataset.
The store description explicitly describes the game as being in a "deep Early Access state," and no 1.0 release date or completion statement has ever been made. The update cadence — major content drops in October 2025, November 2025, December 2025, and June 2026, plus frequent patches — shows Pavel Kudinov is consistently and substantively building out this game. There is no indication that development is winding down.
Evidence
Feature patch v0.10.2.0 released, adding selection box/ruler, group editor, and a live reactions graph — the most recent developer communication, just 12 days before this assessment
Major update v0.10.0.0 released on the game's 6th Early Access anniversary, introducing a new Biome simulation with planet sim and DNA editing
Media
Details
Developer
Publisher
Pavel Kudinov
Achievements
—
Platform
Windows
Controller
—
Steam Deck
Unsupported
Players
Single-player
About this game
*** NOT ALL GPU SUPPORTED! CHECK DEMO FIRST ***
You probably heard the theory that we live inside a computer simulation.
I wanted to create a big sandbox game in which you can create your own simulations, change the laws of physics, design mechanisms, create A-Life worlds and inhabit them with living beings, experiment with evolution and AI.
SST is a particle simulator that uses a graphics card as a supercomputer to calculate physics. The more powerful the graphics card, the greater the gameplay!
The building block of all worlds is an atom. Atoms can have links, thus producing spatial structures.
The physical properties of materials can vary over a wide range, allowing the simulation of gases, liquids, soft and solid bodies, various chemical processes and states of matter.
Perhaps even creating a virtual life!
For example, the “Protobiome” simulation is a living virtual world with light, water, earth, growing plants and dwelling creatures, guided by evolutionary genetics.
ATTENTION!
The game is in the deep Early Access state. It may be unstable. It may also completely fail to run on your system.
The game had initially been developed for NVIDIA cards. Therefore, the project works most optimally and efficiently on modern NVIDIA GPUs using CUDA. However, I'm willing to support the widest possible range of gaming systems. This is why the game also has an OpenCL port, so it can run on most AMD graphics cards as well.
It is really important that you have a recent version of the video driver installed. In case of problems running the game, first of all, please, try to update the video card driver!
I HIGHLY RECOMMEND to try the free demo version of the game before buying the Early Access version. This will let you make sure the game works well on your system!
You probably heard the theory that we live inside a computer simulation.
I wanted to create a big sandbox game in which you can create your own simulations, change the laws of physics, design mechanisms, create A-Life worlds and inhabit them with living beings, experiment with evolution and AI.
SST is a particle simulator that uses a graphics card as a supercomputer to calculate physics. The more powerful the graphics card, the greater the gameplay!
The building block of all worlds is an atom. Atoms can have links, thus producing spatial structures.
The physical properties of materials can vary over a wide range, allowing the simulation of gases, liquids, soft and solid bodies, various chemical processes and states of matter.
Perhaps even creating a virtual life!
For example, the “Protobiome” simulation is a living virtual world with light, water, earth, growing plants and dwelling creatures, guided by evolutionary genetics.
ATTENTION!
The game is in the deep Early Access state. It may be unstable. It may also completely fail to run on your system.
The game had initially been developed for NVIDIA cards. Therefore, the project works most optimally and efficiently on modern NVIDIA GPUs using CUDA. However, I'm willing to support the widest possible range of gaming systems. This is why the game also has an OpenCL port, so it can run on most AMD graphics cards as well.
It is really important that you have a recent version of the video driver installed. In case of problems running the game, first of all, please, try to update the video card driver!
I HIGHLY RECOMMEND to try the free demo version of the game before buying the Early Access version. This will let you make sure the game works well on your system!
Are these done yet?
Last evaluated Aug 19, 2026
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