The Powder Toy is a physics sandbox game where you can blow things up, operate atomic power plants, and develop a CPU, among other neat sims. A Portable version from PortableApps is also available.

The Powder Toy is a desktop version of the classic 'falling sand' physics sandbox, which can simulate air pressure and velocity, heat, gravity, and a countless number of interactions between different substances. The game provides you with various building materials, liquids, gases, and electronic components that can be used to construct complex machines, guns, bombs, realistic terrains, and almost anything else. You can then mine them and watch cool explosions, add intricate wirings, play with little stickmen, or operate your machine. You can browse and play thousands of different saves made by the community or upload your own – we welcome your creations!

There is a Lua API – you can automate your work or even make plugins for the game. You will need to play around with this to produce a proper working display, and we suggest going to the Wiki for general descriptions, how-to build, etc.

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