Physigons 1.2.1 (classic). Repacked with visual studio dlls and better instructions.
Physigons is a physics sandbox game. You are in a simple world in which you build whatever you like. Take simple primitives, such as boxes, spheres, and prisms, and assemble them into interesting structures. Then, put your creations to the test with the physics engine. Start physics, watch your building collapse, then reset it and keep building with no lost work. Create intricate machinery using joints, motors, and an electrical system. Test your invention in the physics engine. Accidentally crash the vehicle you made? No problem, just reset the world the world to the instant physics started and undo the damage. Cause massive-scale destruction with thousands of objects. Physigons uses Nvidia PhysX™ to provide an epic physics simulation.