Want more mods for Cities: Skylines? Explore our entire collection!
Master Key
"Every milestone, unlocked from minute one."
How do I install Master Key?
Download the free ProjectMods desktop app, then install Master Key for Cities: Skylines in one click.
</>What does Master Key do?
Cities: Skylines normally drip-feeds its toys as your town grows: hospitals, universities, transit lines, unique buildings, monuments and wonders all sit locked until you hit the next milestone. Master Key throws the whole toybox open in one click. Want to design a full metro network around a village of 500? Drop a wonder in your starter town? Plan a city with every service available from the first road? Now you can. Perfect for creative builders, planners who want the complete palette from the start, and anyone who'd rather design than grind. Unlocks progression milestones, monuments and wonders together - one press and nothing's off the menu.
</>What is Master Key?
Master Key throws open the whole Cities: Skylines toybox in one click, unlocking every service, building, policy, monument and wonder without hitting population milestones first. Design a full metro around a village of 500, drop a wonder in your starter town, or plan with the complete palette from day one. Made for creative builders who'd rather design than grind. Free from ProjectMods.
</>Common questions about Master Key
What does Master Key do in Cities: Skylines?
Master Key is a Cities: Skylines mod that throws the whole toybox open in one click. Normally the game drip-feeds its content as your town grows — hospitals, universities, transit lines, unique buildings, monuments and wonders all sit locked until you hit the next milestone. Master Key unlocks progression milestones, monuments and wonders together, so nothing's off the menu from minute one. Want to design a full metro network around a village of 500, drop a wonder in your starter town, or plan a city with every service available from the first road? Now you can. It's a free ProjectMods mod, perfect for creative builders who'd rather design than grind.
What exactly does Master Key unlock in Cities: Skylines?
Master Key opens up three things at once in Cities: Skylines: the progression milestones that normally gate your services and buildings, plus the monuments and the wonders that usually require very specific conditions. That means hospitals, universities, public transit, unique buildings, monuments and wonders all become available together in a single press, rather than trickling in over hours of growth. The idea is a complete palette from the start — every tool the game has to offer, ready the moment you want it. It focuses on unlocking what's available to place; the buildings themselves still work by their normal rules once you drop them down, so your city plays fairly around the fully-opened menu.
Can I really build wonders and monuments in a tiny starter town with Master Key?
Yes — that's exactly the kind of thing Master Key is built for in Cities: Skylines. Because it unlocks monuments and wonders alongside the progression milestones, you can drop a wonder into a village of 500 or plan a full metro network before your town would normally have earned any of it. The usual requirement to grow to a specific population first simply doesn't stand in your way. This makes Master Key a favourite for creative builders and planners who want to lay out an ambitious design from the first road rather than unlocking it piece by piece. Everything you place still functions normally once it's down — you've just skipped the milestone grind that gated it.
Is Master Key a one-time unlock or a toggle I leave on?
Master Key is a one-press unlock in Cities: Skylines — you click it and the milestones, monuments and wonders open up together, giving you the complete palette to build with. It's designed to get everything onto the menu in a single action rather than being a switch you constantly manage. That fits how people use it: most players want the full toolset available from the start of a creative build, so one press does the job and you get straight to designing. From there you're free to place whatever you like, whenever you like, with nothing greyed out. If you want the complete set of options up front instead of grinding milestones, that's precisely what Master Key delivers.
Who is Master Key for, and does it pair with other ProjectMods mods?
Master Key is made for creative builders, planners and anyone who'd rather design than grind in Cities: Skylines — people who want the complete palette of services, unique buildings, monuments and wonders from the first road instead of unlocking them milestone by milestone. It pairs naturally with Land Grab, another ProjectMods mod, so you have both the whole map and the whole tech tree open at once, and with Bottomless Budget so cost never stops you placing what you've unlocked. Together they clear away land, money and progression so the only limit left is your imagination. Master Key is free from ProjectMods, the community-first game modding platform and desktop app, installed in one click.
What options does Master Key include?
Unlock Everything
Unlock every milestone, monument and wonder right now.
Master Key is the ProjectMods mod that throws open every service, building, policy, monument and wonder in Cities: Skylines from minute one, with no population milestones to grind first.
System Requirements
What features does Master Key include?
- Open every service, unique building, policy, monument and wonder in one click - no population targets first
- Design a full metro network around a village of 500 if that's the city you're picturing
- Drop a wonder into your starter town before the first traffic jam
- Get the complete building palette from your very first road instead of grinding milestones
Best For
- You'd rather design than grind and want every tool on the menu from minute one
- Planning an ambitious city and need the full palette before you commit to a layout
- Recreating a real place that needs specific services a small town would never have unlocked yet
- Creative builders who want a wonder or monument as the centerpiece of a tiny, deliberate town
Land Grab
Claim every tile on the map in one click. No milestones to grind, no per-tile bill - the entire buildable area is yours from the start.
City Budget (Give Money)
Pick an amount and drop it straight into the city treasury. Fund the projects you actually want to build instead of babysitting a spreadsheet.
Trophy Case
Fill out your achievement list without the grind. Unlock a single one, unlock the lot, or wipe them clean and start fresh.
