Population is a very important element of the city. Every crowd want people. The bigger number crowd can absorb smaller one. You need to keep running, find people, then invite them join in. You are racing with other players. Avoid the big crowd, to eat small one. I believe you could build the biggest crowd in this city.
With the application of 3D technology, games have more and more simulation capabilities to restore existing scenes or create imagined scenes in the virtual space. Game designers actually can't design what they have never seen. So you will meet many scenes from film and television works like battlefields, factories, sports venues, and wildlands. Then we can go the dangerous places without any risks. You can also perform some roles that most of us can't experience in our whole life including soldiers, scientists, agents, police officers, doctors, customers, drivers, and hunters. Most simulation scenes have many roles, you can even play as an animal.
