If in doubt, the protagonist of the story Parallel World Spot The differences is already convinced that parallel worlds exist. His confidence is justified, because he himself was in one of these worlds and he was very unusual. And he got into them directly from the old university library. The hero went in search of the right book, accidentally pressed a lever and two portals appeared in front of him. Without hesitation, he stepped into the right and ended up in a strange, unknown world, where everything was a couple. To return home, you need to find and eliminate the differences between the scenes. Help the traveler, otherwise he will be stuck here forever.