Isolation.

This is from my past self mind, that I continued because of boredom and inspiration.
In a world of segregation and separation, people are forced and contained in
their home country. World War three was resolved with a unthinkable solution, each country is separated. No trading, no remembrance, and no contact with anyone outside your home country.
One day a boy goes into unknown video game territory while trying to hack his game. He is entered into a chatroom, that tells him of his mission. Confused, the boy tries to contact the others in the chatroom but is now aware of the barrier that separates them is broken.
The story follows an action packed, end of the world chase that the characters will have to face their worst fears to defeat this unknown figure that taunts them.