What was the point of blocking the robot outbreak using Kill-Ballad? In Robotics;Notes, there is some sort of robot outbreak in the city. They all go out of control and attack what seemed like the city hall.

When Frau tries to hack into the servers to stop the outbreak, she is redirected to the Kill-Ballad game. When Kai beats the enemy, access is given and they manage to stop the outbreak.

What was the point of using Kill-Ballad to block the access to the servers? Couldn't the enemy just say "nah, you don't have access, go away" rather than giving a chance to actually stop the outbreak?
I believe the game was a defense against fixing the problem. 

The guy who started it was one of the people who worked on the game with Frau, so he must have been betting that the person who was trying to gain access would not beat the hacked kill-ballad character, even if it was Frau herself. 

(since she made the system she could give herself the rights back to fix the problem but couldn't play kill-ballad well enough to beat the hack)

(It also gave Kaito a chance to save the day ;])