Zoo Tycoon 2 was the sequel to Zoo Tycoon.
Unlike the prequel, this game was in full 3D. As well, all Guests were automatically named and all look different. There are also new features, such as click and drag fence building, and new guest amusement features.
Campaign Mode is a mode were you finish certain objectives to unlock items such as trophies and gardens, for use in other modes. These challenges get harder as you beat them.