I just discovered this game...

Plague Inc: Evolved is a unique mix of high strategy and terrifyingly realistic simulation. Your pathogen has just infected 'Patient Zero' - now you must bring about the end of human history by evolving a deadly, global Plague whilst adapting against everything humanity can do to defend itself.
Nice. I may use parts from my current PC for my...
The storage drives and RAM came from the old PC. I...
Yeah. It’s Microsoft so it’s unfortunate it didn’t...
🤣
This is 99 cents on iOS and I just picked it up. If you can get it for a buck, I seriously recommend it.
The tutorial is very good and it's not too hard, but don't let it fool you, normal is much more difficult. After a couple games I got the hang of things and generally lost under two scenarios: 1. I killed everyone except a couple people in some countries(I wasn't strong enough to infect) or 2. I infected everyone on earth but my disease wasn't strong enough to kill everyone before they found a cure.
Finding that balance is a fun thing to figure out and I finally did and my disease "Sauron" wiped out everyone on earth, so yay! It unlocked a new game mode and a special ability and it seems the more I win the more I unlock. This is available on Steam and is $15 and seems to be the same game, but I am not really sure about that entirely.
Well worth a dollar if you are looking for a very fun strategy game where each game lasts a handful of minutes.