![cities skylines road hierarchy cities skylines road hierarchy](https://i.pinimg.com/originals/29/e0/4d/29e04d87bca11fb52ad637324a3a1661.jpg)
People have certainly built Cities: Skylines cities with mixed-use developments, quaint mountain towns, little enclaves built around a park or monument, car-less cities, pedestrian-only cities, modular cities connected by mass transit, etc. The Sims 3 was scaled up so you could seamlessly walk around small towns, but The Sims 4 went back to focusing on houses or apartments in individual lots or flats, instead of expanding to simulating entire cities.
![cities skylines road hierarchy cities skylines road hierarchy](https://speed-new.com/wp-content/uploads/2016/08/42564574564565624.png)
But it doesn't simulate "urban dynamics" between zones, just "personal dynamics" between the people and the architecture and contents of the buildings. The Sims is whole a game unto itself at a different level of abstraction, that lets you build multi-story residential and commercial buildings with walls, doors, windows, furniture, etc. It's as much a game about pedestrian traffic, elevators, queuing and congestion, as an economic simulation. Sim Tower supports mixed use zoning (with different discrete rooms in the same building), but just within one high rise tower, not a whole city. Imagine if every building and skyscraper in the city were that complex! The closest thing SimCity comes to mixed use zoning is multi-layered Arcologies, and the interface to those is pretty complicated and unwieldy. Think of the number of extra user interface panels and gizmos and views and pop-ups and menus that users would have to wrangle in order to build, edit, query, visualize, and maintain 3D multiple story mixed use buildings in a city simulation, instead of having a simple 1:1 correspondence between space on the 2D map and zone type.
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Theoretically the computer can simulate whatever model you can dream up, but the much harder problem is the user understanding, visualizing and editing that model with an easy interface that feels fun like playing a game, not tedious like doing your taxes in Excel or rigging skeletons in 3D Studio Max. It's very much because of gameplay issues.