Germ City: Idle Tycoon

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Everyone
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Everyone
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About this game

Tap, spread, and turn the whole world green! Build a germ empire in this idle clicker tycoon, and keep earning even while you're offline.

■ Splat! A tiny germ just landed in your neighborhood!

A cute little green germ rode a solar flare all the way to Earth.
Its mission? Start in your own city, spread to cities around the globe, and one day turn the whole planet green!
One tap is all it takes to start your germ empire.

Your germs never take a break, even when you do.
On your commute or a quick coffee break, your germ empire keeps on growing!

■ FEATURES

▶ SATISFYING TAP-AND-SPREAD ACTION
- Tap and hold the petri dish to unleash a flood of germs.
- Germs rush into buildings and infect them, producing slime and earning you genes.
- Tap with multiple fingers to go even faster! Is this really your top speed?

▶ FROM SHACKS TO SLIMETOPIA
- Shacks, convenience stores, apartments, skyscrapers… all the way to Slimetopia!
- Upgrade 19 types of buildings to house more and more germs.

▶ 12 CARRIERS, FROM MICE TO JUMBO JET FLEETS
- Mice, stray cats, delivery scooters, taxis, subways, jumbo jet fleets…
- Add carriers to ship slime farther and faster.

▶ RESEARCH STRONGER GERMS
- Dozens of research upgrades boost your growth rate and earnings.
- Unlock special Golden Research to push your germ empire past its limits.

▶ WORLD CONQUEST STARTS AT HOME
- Begin your first outbreak in a city in your own country.
- Spread across 19 cities worldwide, each with new germs and landmarks to discover, including Space Germs and Legendary Germs!
- Don't miss the wacky germ news headlines in every city.

▶ PRESTIGE AND GROW EVEN FASTER
- Collect Golden Spores and prestige for permanent bonuses.
- Every prestige lets you spread faster and farther than before.

▶ PLENTY TO DO EVERY DAY
- Complete challenge missions for rewards.
- Take on timed Culture Contracts and collect crowns.
- Catch flying pigeons, open gift trucks, and join weekly events for extra rewards.
- Speed up your growth with 25 different boosts.

▶ IDLE EARNINGS WHILE YOU'RE AWAY
- Earnings pile up in your storage tank even when you're offline.
- Come back and spend them on upgrades right away!

One tiny germ. One big green planet.
Become the ruler of Germ City today!

[Contact Email]
service.ak@gameduo.net

[Privacy Policy]
https://gameduo.net/en/privacy-policy

[Terms of Service]
https://gameduo.net/en/terms-of-service
Tap to spread germs worldwide! Build your idle germ empire, even while offline.
Updated on
Nov 13, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    Device or other IDs
  • This app may collect these data types
    Personal info, Financial info and 3 others
  • Data is encrypted in transit
  • Data can’t be deleted
Content rating
Everyone
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About the developer
주식회사 게임듀오
service@gameduo.net
253 Pangyo-ro, 분당구, 성남시, 경기도 13486 South Korea
+82 70-8865-1186

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