Minecraft started as a one-week experiment.
Markus Persson, better known as Notch, built its early version in less than a week in 2009.
It went from a small indie project to the best- selling video game ever, with 300M+ copies sold.
In 2014, Microsoft bought Mojang for $2.5 billion, making Notch a billionaire.
But later, surrounded by friends and celebrities, he admitted he had never felt more isolated.
Success can be strange.