I can also vouch for the game being worth the buy. Cities Skylines is loads of fun, whether you're a city building veteran or new to the genre. If you enjoyed SC2013, you will probably enjoy CS as well. The core gameplay (building roads, zoning, providing utilities and services, etc.) is similar, but CS offers more freedom and depth because of the larger maps, ability to control density, more expansive transportation options, improved simulation, and of course, the modding capabilities. Visually, SC had more colorful and detailed models, but CS looks more realistic. I would compare playing SC to playing with a toy city set - everything is pretty, but it's limiting and simplistic. In contrast, Skylines feels more like you're actually controlling a real city with real people. It also has its flaws, but overall, I think it's far more detailed and true to city simulation than SimCity'13. CS provides over twice the amount of content and possibilities for half the price (considering launch prices) than SC. As far as beginning mods go, I would recommend City Vitals Watch, which adds a menu to quickly check important city stats, Tree Brush, which allows you to cover larger areas with trees, and Automatic Bulldoze, which automatically removes abandoned and burned buildings. None of these are necessary, but I find them very helpful. There are achievements through Steam, but they don't really guide you. The game does, however, have certain city stages that you progress through as you increase your population. Unless you're using a mod that unlocks everything, you gain new buildings, city tiles and services when you reach the next population benchmark. This is sort of like a mission system, as it gives you a goal that you need to achieve, but it doesn't necessarily help you learn and it does limit you when you first start out. Like I said, though, there is a mod that provides you with everything at the beginning, and there are tons of other mods that allow you to customize your experience to your liking. Hope this helps! If you're interested in city simulation games, I'd go for it. Cities Skylines is one of the best.