Cartman starts ranting about how he needs to take down Kyle and reclaim his title as the best Phone Destroyer player. He convinces Butters to help him create a hack to destroy Kyle's progress and ensure his own victory.
In the end, they manage to contain the hack and restore order to South Park. Cartman, however, gets punished for his role in creating the chaos and is forced to give up his Phone Destroyer title.
The episode starts with Cartman, Kyle, Stan, Kenny, and Butters hanging out at Cartman's house, bored out of their minds. Cartman suddenly remembers a popular mobile game called "Phone Destroyer" that he's been playing nonstop for weeks. He starts bragging about his high score and how he's the best player in the world.