As an Amazon Associate I earn from qualifying purchases and sometimes recommend products from other sellers at no extra cost you. For more details see my disclosure policy and privacy policy.
Cities: Skylines II completely overhauls how you grow your virtual metropolis with a fresh take on progression that gives you more control than ever. If you loved the original game but want to understand how the sequel handles city development, this guide breaks down everything you need to know.
The New Path to City Growth
Gone are the days when simply hitting population targets unlocked everything. The sequel introduces a two-pronged system that rewards both passive city management and active building decisions.
The core of this system revolves around two key elements:
- Milestones – 20 achievement stages that mark your city’s evolution
- Development Trees – Specialized tech trees that let you customize your city’s growth path
Let’s break down how each works and the best strategies to use them.
Chill Place Gaming Store
Take your game further 🎮
Reference sheets, printable guides, and gaming goodies — made by the Chill Place Gaming team to help you play smarter.
Secure checkout
powered by Shopify

Milestones: Beyond Just Population Counts
In Cities: Skylines II, reaching milestones requires earning Expansion Points (XP) rather than just growing your population. This makes for a more dynamic progression system where good city management matters as much as size.
You earn XP in two main ways:
- Passive XP generation happens 16 times each in-game day based on your population growth and overall citizen happiness. Keep your citizens happy, and you’ll steadily progress.
- Active XP rewards come from specific actions you take – placing new service buildings, upgrading existing ones, building signature landmarks, or expanding your road network.
This dual approach means you can speed up your progress through smart planning and strategic building choices, not just by cramming more people into your city.
What Each Milestone Unlocks
Reaching a new milestone feels rewarding because you get several benefits at once:
- Cash bonuses to boost your treasury
- Development Points to spend on specialized upgrades
- Expansion Permits that let you buy new land tiles
- Access to new city services and policies
- Additional zone types like higher density housing or office zones
- Better financial options including higher loan limits

The steady drip of new tools and options keeps the game feeling fresh as your city grows from a small town to a bustling metropolis.
Development Trees: Customizing Your City’s Path
The most exciting addition to progression in Cities: Skylines II is the Development Tree system. Think of these as tech trees that let you specialize your city based on your priorities.
Each time you reach a milestone, you earn Development Points to spend across different categories:
- Roads and transportation
- Electricity and water infrastructure
- Healthcare services
- Education systems
- Waste management
- And many more
Within each category, you can unlock new building types, service options, and infrastructure tools. For example, the roads category might let you unlock underground parking, while healthcare could give you specialized hospitals.

The key difference from the original game? You choose the order. Want to focus on education first? Go for it. Need better roads before anything else? That’s an option too.
Strategic Tips for Efficient Progression
Based on player experiences, here are some tips to help you progress faster:
- Focus early Development Points on infrastructure that increases happiness – this boosts your passive XP gain
- Build service buildings strategically, as each new placement grants active XP
- Don’t forget to upgrade existing services when possible – these also grant XP
- Balance expansion with quality of life – growing too fast without services will hurt happiness and slow your passive XP
- Use your Expansion Permits to access resources you lack in your starting area
Why This System Improves the Game
The new progression system makes each city feel unique. Your choices about which features to prioritize create different development patterns and challenges.
Rather than following the same unlock path every game, you can focus on building the type of city you want. Maybe you’ll create an education powerhouse first, or perhaps focus on transportation infrastructure to support industrial growth.
This flexibility makes the game more replayable and lets you experiment with different city-building strategies on each playthrough.
Final Thoughts
Cities: Skylines II’s progression system rewards thoughtful city planning and active management more than simple growth. By understanding how milestones and development trees work together, you can shape your city’s evolution in ways that weren’t possible in the original game.
Whether you’re building your first city or your fiftieth, these tools give you more control over your virtual citizens’ future than ever before.
Have you tried Cities: Skylines II yet? What development paths have you found most successful? Let us know in the comments!
Stop Fighting Traffic.
Start Designing It.
Get the CS2 Road & Junction Toolkit, 11 decision tools for diagnosing jams, picking the right junction, and fixing your city's traffic for good.
- ✓Road hierarchy rules and the 5 mistakes that break them
- ✓A junction selection cheat sheet and a diagnostic flowchart
- ✓A full worked example, before and after





