Instead of simulating N number of bodies, they would be simulating a huge number of points. That is, taking your simulation space, discretizing it to a hi-res 3-D grid and checking the effect that each and every point in that grid has on all neighboring points at every timestep.
General relativity requires simulating the spacetime itself. Newtonian physics just requires n-body mechanics, so it is much easier to implement. However, Universe Sandbox 2 uses 300-year old Newtonian physics, rather than general relativity. If you want to simulate day-long events, like planets crashing, it might be better. Means that if you want to simulate the Solar System over a long period of time, it won't be very accurate. The slower the time, the more accurate the calculations. Its accuracy degrades as you increase the flow of time. Not sure if these kinds of questions are allowed here, but I may as well answer it.
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