Then of course they need electricity, but what power station will you, the mayor, go for? Coal is cheaper, but dirtier and more polluting. Nuclear is more expensive but with it comes the risk of nuclear meltdown. Then to decide on the number of police and fire stations, too few and your city will be considered unsafe and people will leave. Too many and their costs will drain the treasury limiting the amount of cash for further development.
The game's biggest challenges are therefore to find the best purpose for each piece of land, to keep people coming and most importantly to convince them to pay the amount of taxes you're demanding. Tax payments are after all the only income you get to maintain and expand your city. Building you city is really just the start. As your village becomes a town, a city, a metropolis the considerations mount. Before long the plethora of decisions you must make as a mayor all have bigger consequences. For example, expanding commercial areas increases the number of people coming to the residential zones but that also increased traffic density. Build more roads to solve this problem and the environment is affected. All of this costs money of course, but tax too much to bring in the finances and everyone will leave anyway.
Completing the game actually feels like a chore rather than exercise in creativity. If measured success is your goal, you’d be far better suited to taking on one of the game’s scenarios. Like the home computer version, the Snes iteration of ‘Sim City’ presents you with the option of solving a pre-made city's problem in an allotted time. Typically these scenarios revolve around some sort a disaster like a nuclear meltdown or flooding, or exclusively to the Super Nintendo version, a Bowser attack on the streets of Japan. Some are even based around real-life disasters that actually happened, such as the San Francisco earthquake of 1906. The scenarios present a way to dip into a play ‘Sim City’ in a shorter dose and they present quite a fun challenge for even the most experienced mayor.