"Now, we have a world that can be populated by some pieces, let's build the last
important class—the Game class.
There is a big change in this class. If you remember, in Chapter 2, General Game
Architecture, User Inputs, and Resource Management, I said that a game with physics
should use two game loops instead of one. The reason for this is that most of the
physical engine works well with a fixed time step. Moreover, this can avoid a really
bad thing. Imagine that your physical engine takes 0.01 second to compute the new