April 10, 2073. A spaceship several tens of kilometers long appeared in the sky. The governments of all countries mobilized all military resources overnight, but the invasion to destroy the Earth, as we often saw in films, did not take place. April 11, 2073. A text with unusual content was launched across all channels and radio stations in the world: “Today, 12,673 inhabitants of the Earth aged 18 to 25 years, both boys and girls, were transferred to a spaceship. They had an unusual chance - to take part in a game, as a result of which everyone would receive a reward, and the winner would receive a special honor... April 12, 2073, time 9:00. The game has begun...