The Popular Must Grow is a free simulation PC game by developer Helmi Buld. It is a minimalistic city builder simulator wherein players will be challenged to create a colony from the ground up with a single citizen to start with. It's easy to get into and learn with simple mechanics, and it does not have a limit on how large your population can increase. 

Massive scale 

In essence, The Popular Must Grow is a city builder sim with a focus on population growth and scale. You'll start with a single citizen to help gather resources to build houses to support more people. You will also need to plant new trees to supplement your needs and crops to provide food for your people. 

The main highlight of the experience is that there's no limit to the number of citizens you can have in your colony, letting you scale as high as you want. There's even a neat feature that tells you when you've surpassed the population of a real-life country. That said, this game can get quite taxing for your PC, especially when you start dealing with millions of numbers, which can also be attributed to why its visuals are so simplistic.

Your machine's the limit 

In summary, The Population Must Grow is a curious city building sim experience that combines simple yet engaging gameplay mechanics with pseudo stress test to see what your PC is capable of. See how high your population can grow before your machine start to give out under the weight of its numbers.