The "story" is told through data. The simulator tracks population density, blast radii, heat radiation, and radioactive fallout to calculate immediate and long-term casualties.
"Game3rb" is a well-known site in the scene for distributing "repacks"—compressed versions of video games that are cracked to bypass digital rights management (DRM).
Cracks can often cause the simulation to crash or prevent updates that fix critical bugs.
You can simulate anything from a single terrorist detonation in a major city to a full-scale exchange between NATO and Russia.