What if a lot of world building was a simulation?

I was reading a post that talked about a video game. The game had a world that was created by a simulation engine. The question was how accurate do you think the simulation would be to real life. If you look at anything, there's always a lot of detail, and as you zoom in more detail gets revealed.<br><br>If we think the world we live in is a simulation, and we think that it may be a low grade simulation, how close of a simulation would it need to be to be considered "accurate".<br><br>At the atomic level or something? It could be argued that electrons orbiting the nodes doesn't need to be fudged at all, or possibly it's a lot less accurate. <br><br>Therefore, how accurate would the simulated world that the video game engine is simulating.