Cities: Skylines is basically the ultimate "build your dream city" simulator. Zoning, roads, public transportation, dealing with traffic jams...it captures all the fun and frustrations of being a city planner. There's a ton of freedom to create exactly the kinda city you want, and with the crazy amount of mods, the possibilities are endless. It's a little overwhelming for beginners, and performance can chug on massive creations, but if you've got the patience to learn, it's incredibly rewarding.