I purchased this game to play solo, off-line. It rapidly becomes clear that the intention is to get you to subscribe to expensive monthly fees, without which you actually get very little. Even if you do subscribe you will have to be patient because the game is released in my view in an unfinished state. In the solo version be aware that you have to log on to play each time. Be aware that despite the company's video footage there is no mass transport element, there are no railways or buses, there is no sound or atmosphere (except the background music) no smoke or effects and what is worse there is very little challenge at all. You would find far more depth in the companys previous game City Life!
I was surprised as a city building enthusiast to be bored after a very short time, despite the very pretty graphics. It soon dawns on you that here is just very little to do strategically. And it would appear that your game will never be upgraded to include more unless you pay a monthly fee.
You do get a one week trial of the "Planet" subscription offer. This was enough time for me to establish for myself that there is really no benefit or extra fun in online play. So I conclude that this is one of the most cynical marketing models I have encountered in recent times.
I only hope the company will see the error of its ways and rectify the situation in the future.
For now I could not recommend.