Close your eyes for a moment. Picture the city you live in — the skyline you know, the streets you walk, the people who are just living their lives tonight. Now imagine the radar operator's phone rings at 2 a.m.

Dozens of inbound tracks detected. Ballistic missiles climbing past the stratosphere. Cruise missiles skimming rooftops at 900 km/h. They are not heading for a distant warzone. They are heading for you.

This scenario has already played out — not in fiction, but in real cities in the last few years. Hundreds of missiles and drones launched at once, designed to saturate any single defence layer. What stood between the city and the strike was not just hardware — it was a guidance algorithm. A piece of mathematics, running in milliseconds, deciding how an interceptor steers itself at hypersonic speed toward a tumbling warhead in the dark.

Proportional Navigation. Augmented PN. Pure Pursuit. Command Line-of-Sight. These are the equations that kept cities standing. Change the algorithm, and the intercept misses. Change the intercept rate by 10%, and lives are lost.

This simulation puts you in the operator's seat. The city is yours to defend. The maths is real. The decisions are yours — and so are the consequences.