Have you ever played the game Plague Inc? If not, it's basically a simulator game where you try to infect the entire planet Earth with a custom-made virus, the end-goal being the end of all human existence. It's an ambitious game for certain, one that takes a certain finesse to play well, but fun even if you don't win a given stage.
In the spirit of bringing every game ever to Minecraft, McMakistein has recreated Plague Inc for you to play! While not a point-for-point recreation (adding every country in the world would be time-consuming at best), it is nonetheless an amazing project, built using only vanilla parts. The video includes an explanation of the redstone that powers this beast. Enjoy!
I don't get it..... Make a minecraft mod for it maybe?
No that's exactly why it's not a mod. People want to push vanilla to its maximum, not write extra code and stick it on. People want to see what's possible with vanilla commands and redstone and see what crazy thing they can make without having to download something extra.