A creative sandbox with real physics: you place parts on a quarter-metre grid, wire pistons and hinges to buttons and timers, and drive whatever you came up with. There is no survival mode and there never will be, the whole game is the workshop.

The interesting part is what holds a build together. Every construction is one rigid body, and the joints between parts are a graph; when a bridge in that graph carries more force than it can hold, that piece tears off on its own. Nothing is scripted, an overloaded cantilever fails because it is overloaded.

Wheels are raycast rather than physical bodies, which is why a car at 40 km/h through a slalom keeps all four corners instead of shaking itself apart. It runs co-op over the local network, with one machine acting as the authority on physics and running exactly the same code the browser runs.