Space Simulation Toolkit v0.8.3.0a - early access

Space Simulation Toolkit (SST) is an ambitious sandbox physics and life-simulation toolkit that treats a GPU like a supercomputer. Its goal is to let players create and experiment with entire simulated worlds: tweak physical laws, assemble mechanisms from basic building blocks, run chemical and state-of-matter simulations, and even cultivate emergent virtual life through evolutionary genetics.

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Why it’s interesting
- The fundamental unit is the atom. Atoms can link to form spatial structures, enabling construction of everything from soft matter to rigid bodies.
- Materials have highly variable physical properties, so you can simulate gases, liquids, soft bodies, solids, chemical reactions and diverse states of matter.
- The engine is designed for experimentation: build mechanisms, create A-Life ecosystems, observe evolution and train simple AI in procedurally governed environments.
- Example content includes "Protobiome," a living virtual world with light, water, soil, growing plants and dwelling creatures governed by evolutionary genetics.

Important technical notes and caveats
- NOT ALL GPUs ARE SUPPORTED - check the demo first. The game was originally developed for NVIDIA GPUs and runs best on modern NVIDIA cards using CUDA. There is an OpenCL port for AMD GPUs, but compatibility and performance vary.
- The game is in deep Early Access - expect instability, bugs, and the possibility it may not run on some systems.
- Make sure your video drivers are up to date. If you experience problems, updating the GPU driver is the first troubleshooting step.
- The developer strongly recommends trying the free demo before purchasing to confirm it works on your hardware.

Key features
- GPU-accelerated particle physics simulation (CUDA and OpenCL support)
- Atom-based construction system with linkable particles
- Wide range of material behaviors (gases, liquids, soft and solid bodies)
- Chemical processes and multiple states of matter
- Sandbox tools to change physical laws and create custom simulations
- A-Life systems and evolutionary genetics (e.g., Protobiome)
- Experimental, moddable environment for creative science-like play

Verdict
SST is a fascinating sandbox for players who enjoy deep, experimental simulation and are comfortable with early-access instability. Its power scales with GPU capability, so if you have a modern NVIDIA card you'll likely get the best experience. Try the free demo first to verify compatibility. Space Simulation Toolkit can be downloaded - test the demo before buying.