I Logged into Doomsday in Advance and Announced the Electromagnetic Gun at the Beginning

A post appeared on the Civil Science Forum. [Mysterious Netizen]: "How do you survive in a search-and-defeat world similar to Escape from Duck Cove? It's quite urgent!" A netizen replied: "Really? Then bring some of that world specialty! Otherwise we won't believe it!" [Mysterious Netizen]: "Is the 200-kilometer electromagnetic gun technology enough? If it's not enough, I still have more." Netizens didn't believe it at first, but after official verification, this electromagnetic gun technology is surprisingly real and has extremely high-tech content! In an instant, the Army Research Institute entered a state of emergency, and the country was searching for the mysterious netizen. However... It can't be found. "Report! The mysterious netizen's account has the highest authority and has modified the underlying logic of the Internet. We can't trace it!" A technician said to the director of Longguo Research Institute in horror. "How is that possible?" The dean was confused for a moment. "Mysterious netizens released technology again, this time it's a honeycomb drone swarm..." "Shuttle!" "Space Elevator!" "Sixth generation fighter!" "Fighting Mecha!" "Even... There is controllable nuclear fusion..." All major countries around the world are shocked. All these technologies are free and open source. Start now! The mysterious netizen's flower language is... Hands down!