Advance through the ages!
The professor has decided to invent the time machine and he was so close. The only missing piece was adding the last component to the time portal. The moment he adds the last part everything starts to crumble and shake. Time portal had created a black hole and the hole sucked the whole world in it.
After a moment of black, the professor opens his eyes and finds himself in the stone age alongside the time portal! To get back to the time where the professor belongs he needs to advance the ages one by one. For that, he uses the portal to bring more people from ages to work to contribute to art, science, food, and production.
Now you can help the professor to advance through the ages!