Mini-game
Build a Nation
A playful population clicker — pick any country on the globe, tap to found a nation, build farms, schools and factories, and climb from Settlement to Civilization. Every country you start keeps growing in parallel while this tab is open. It's a game score, not real demographic data. Progress is saved on this device only; nothing is sent to our servers.
Step 1
Pick a country on the globe
Purely cosmetic — flag and name only. Development shown on the globe reflects your game score, never real population data.
🌐 0/49 nations started
Shop
Growth drivers
Each building adds steady growth per second.
Pick a country on the globe to start building.
Save
Move progress to another device
Everything happens in your browser — generating or loading a code never touches our servers.
Generates a code with all your nations. Paste it into Build a Nation on any other device to continue there.
Paste a code generated on another device to bring that progress here.
Guide
How to play
The full rundown — buildings, tiers, prestige and the hazards that keep a run interesting.
Pick any country on the globe and tap it to found a nation — each tap adds citizens, with an 8% chance to land a critical hit worth 6x. Spend citizens on buildings for steady passive growth per second; each purchase raises that building's next price by 15%, the classic idle-game cost curve.
Once a nation crosses 1,000 citizens (Village tier), power-ups start spawning near the tap zone and decision events occasionally ask you to pick between two trade-offs — both stack permanent bonuses that survive a prestige reset. At the same tier, asteroids and disease outbreaks start testing your defenses: unintercepted asteroids cost 8% of your citizens, uncured outbreaks cost 6%. Recruits, ambassadors, asteroid defenses and doctors are permanent hires that counter these — buy them once, they work forever for that nation.
At 1,000,000 lifetime citizens, prestige unlocks: founding a new nation resets its current citizens and buildings but grants permanent prestige points, each worth +10% growth and tap power for that country, forever. Every country you've started keeps growing in parallel while this tab is open — nothing is shared between them.
Progression
Tiers
What a nation is called at each citizen threshold.
| Tier | Citizens needed |
|---|---|
| Settlement | 0 |
| Village | 1.0K |
| Town | 50.0K |
| City | 1.00M |
| Metropolis | 25.00M |
| Nation | 500.00M |
| Empire | 10.00B |
| Civilization | 250.00B |
Shop
All 8 buildings
Base price and growth at zero owned — each purchase raises that building's next price by 15%.
| Building | What it does | Base cost | Citizens/sec |
|---|---|---|---|
| Hut | One family, one roof. | 15 | +0.1 |
| Farm | Feeds the next few huts. | 100 | +1 |
| Marketplace | Trade draws newcomers. | 1.1K | +8 |
| School | Families settle where kids can learn. | 12.0K | +47 |
| Clinic | Fewer reasons to leave. | 130.0K | +260 |
| Factory | Jobs pull in whole neighborhoods. | 1.40M | +1.4K |
| University | A reputation that travels. | 20.00M | +7.8K |
| Metro & Airport | The whole world can reach you now. | 330.00M | +44.0K |
Bonuses
Power-ups
Unlocked at Village tier — a clickable icon appears near the tap zone every 25-45 seconds, one of these at random.
A newcomer just moved in.
Every building runs at double speed.
Every tap hits 3x harder.
Asteroids and outbreaks can't touch you.
Your next tap is a guaranteed mega-crit.
Favorable winds triple growth for a while.
Every building costs 35% less for a while.
A crowd gathers and taps for you.
A census turns up citizens you didn't know you had.
Farms and fields yield double for a while.
Frequently asked questions
Is Build a Nation based on real population data?
No. Citizens, growth rates and every number in this game are a game score, generated by the buildings and taps you buy — never real demographic data. The country you pick only changes the flag, name and globe marker. For real cost-of-living, salary and population figures, see the city and country pages elsewhere on Mundevo.
Do I need an account to play?
No login, no account, no email. Progress is saved in your browser's local storage only — nothing is sent to Mundevo's servers. Clearing your browser data or switching devices resets it unless you use a save-transfer code first.
How do I move my progress to another device?
Use the "Move progress to another device" panel at the bottom of the page: it generates a copy-pasteable code from your current save, which you paste into the same panel on the other device to load it. Everything happens client-side; the code never touches a server.
What is prestige and when does it unlock?
Prestige unlocks once a nation reaches 1,000,000 lifetime citizens. Founding a new nation resets its current citizens and buildings, but grants permanent prestige points — each one adds a lasting +10% to that country's growth and tap power, so later runs snowball faster.
What do power-ups do?
Once a nation reaches Village tier, a clickable icon occasionally appears near the tap zone for a few seconds. Claiming it triggers one of several effects: an instant citizens bonus, a temporary growth or tap multiplier, a shield against asteroids and disease, a discount on every building's price, a guaranteed critical tap, or a short auto-tapping rally.
What are recruits and ambassadors?
Recruits and ambassadors are permanent auto-tappers you buy with citizens — up to 7 recruits (tap every ~4s) and 4 ambassadors (tap every ~2s, worth 1.5x a normal tap). Unlike buildings, they survive a prestige reset — once hired, they keep working for that nation forever.
Can I grow more than one country at once?
Yes. Every country you start keeps growing in the background — at its own pace, with its own buildings and tier — for as long as the tab stays open and visible. Switch between them anytime from the globe or the "Your nations" table.
Progress is stored locally in your browser (not sent to our servers). See Privacy for details.