From Cities: Skylines Wiki
This article is considered accurate for the current version of the game.
- New services allow you to add new services to your city. When you unlock a new service, you are also given access to a basic building of that type. At later milestones you can unlock new buildings for those services. Usually new buildings provide you with more effective means of managing your city.
- New zones include higher density residential and commercial zones and office zones.
- Unique buildings include various significant buildings, each with separate unlocking requirements and benefits. Monuments are unlocked at the last milestone.
- When a new area is unlocked, you can choose to buy one of the adjacent areas in the area view to expand your city. Some of the areas can have water areas, highways, and/or natural resources. You can have a total of nine areas unlocked by the end of the game, but this could be increased to a total of 25 areas or even 81 areas with Steam Workshop modifications.
List of milestones
The population requirement appears to depend on the map selected, most likely how much of the map is suitable for building. The exact formula is currently unknown.
Smoke Detector Distribution
|Tiny Town||1300||—||Decoration||Level 2 unique buildings||—||Parks and Recreation
Level 3 unique buildings
|Ore Specialization||Recreational Use
No electricity for heat
Only electricity for heat
Roads with Bus Lane
|Advanced Wind Turbine
Geothermal heating plant
|Busy Town||4600||—||City planning policies||Level 4 unique buildings
Leisure & Tourism unique buildings
|Free Public Transport
Heavy Traffic Ban
Bike ban on sidewalks
Highway with Sound Barrier
Roads with Bicycle Lane
Oil Power Plant
|Big Town||7000||4||Taxation policies||Level 5 unique buildings
Harsh prison sentences
Tax raises and reliefs
Let go of Leisure
|Small City||10000||—||—||Level 6 unique buildings
|—||Big Business Benefactor
High Tech Housing
Industrial Space Planning
Small Business Enthusiast
|—||Cargo Train Terminal
Hydro Power Plant
Water Treatment Plant
|Grand City||19000||—||Third Loan||—||—||—||—||Solar Power Plant||—|
|Capital City||32000||6||—||Ship||—||—||—||Cargo Harbor
|Colossal City||40000||7||—||—||—||—||—||Nuclear Power Plant